In 2009, cloud computing went mainstream to become one of the biggest tech buzzwords of the year 2010. “Take it to the cloud!” has become a popular motto for large enterprises, small businesses and start ups. Cloud computing services exist along a spectrum from open public to closed private. Gartner expects all large enterprises will have a dynamic sourcing team in place by 2012 that is responsible for ongoing cloudsourcing decisions and management.

We partnered with PeerIndex, again, to come up with a list featuring the 25 most influential people on Twitter on the topic of cloud computing. Our top 25 list is not ranked based on their overall PeerIndex score , but based on each one’s topic resonance score, which measures how their actions within cloud computing community resonant with the community.

You can follow our list of Cloud Computing’s top 25 influentials on Twitter or get more info on the PeerIndex group we’ve created to stay on top of the latest news, insiders’ insights and emerging trends in cloud computing.

Picture 9 The 25 Most Influential People Tweeting About Cloud Computing1. Jeff Barr

PeerIndex: 65

It comes as no surprise to find someone from Amazon on our #1. Jeff Barr is a Senior Manager at Cloud Computing Solutions at Amazon.com and a Web Services Evangelist. If you simply can’t get enough of his tweets, you can read his blog here.

Follow @jeffbarr

 The 25 Most Influential People Tweeting About Cloud Computing2. Werner Vogels

PeerIndex: 66

Werner Vogels is the CTO of Amazon and was one of the speakers of TheNextWeb conference in 2010

Follow @werner

Picture 111 The 25 Most Influential People Tweeting About Cloud Computing3. James Urquhart

PeerIndex: 65

Urquhart describes himself in his Twitter bio as: “Father, husband, technologist, author: The Wisdom of Clouds (CNET), cloud computing SME” You can read his posts on cloud computing here.

Follow @jamesurquhart

Picture 121 The 25 Most Influential People Tweeting About Cloud Computing4. Vanessa Alvarez

PeerIndex: 66

Vanessa Alvarez works as an analyst with Forrester covering storage. Her focus as a researcher is primary on storage architectures and strategy, the evolution of these as they relate to converged infrastructure and cloud computing scenarios.

Follow @vanessaalvarez1

Picture 131 The 25 Most Influential People Tweeting About Cloud Computing5. Reuven Cohen

PeerIndex: 65

Founder of Enomaly, a world wide leader in Cloud Computing and creator of the CloudCamp series of events around the globe. You can read Cohen’s blog here.

Follow @ruv

Picture 141 The 25 Most Influential People Tweeting About Cloud Computing6. Krishnan Subramanian

PeerIndex: 63

Better known as Krish, he is an industry analyst covering Cloud Computing and Open Source, an advisor, entrepreneur and blogger.

Follow @krishnan

Picture 151 The 25 Most Influential People Tweeting About Cloud Computing7. William Toll

PeerIndex: 67

A cloud computing marketing professional that holds the position of VP, Marketing at the web performance company Yottaa.

Follow @utollwi

Picture 161 The 25 Most Influential People Tweeting About Cloud Computing8. Dana Gardner

PeerIndex: 63

Gardner is president and principal analyst at Interarbor Solutions. He is also a blogger and podcaster.

Follow @Dana_Gardner

Picture 171 The 25 Most Influential People Tweeting About Cloud Computing9. Mårten Mickos

PeerIndex: 61

The former CEO of MySQL is now the CEO of Eucalyptus Systems. Eucalyptus Systems delivers private cloud software that enables enterprises and government agencies to establish their own cloud computing environments.

Follow @martenmickos

Picture 181 The 25 Most Influential People Tweeting About Cloud Computing10. Simon Wardley

PeerIndex: 63

Wardley currently works as a Researcher at Leading Edge Forum (CSC). You can read his posts on his personal blog “Bits or pieces?”.

Follow @swardley

Picture 191 The 25 Most Influential People Tweeting About Cloud Computing11. Christofer Hoff

PeerIndex: 63

Director, at Cloud & Virtualization Solutions, STBU, Cisco Systems, Hoff is a busy man as he is also founder at HacKid and founder & Chief Goat Herder at CloudAudit. Read his blog here.

Follow @beaker

Picture 26 The 25 Most Influential People Tweeting About Cloud Computing12. Michael Sheehan

PeerIndex: 62

Based in San Francisco Bay Area, Sheehan is a technology evangelist at GoGrid and blogger at HighTechDad.com

Follow @HighTechDad

Picture 201 The 25 Most Influential People Tweeting About Cloud Computing13. Greg Knieriemen

PeerIndex: 63

Co-host at Infosmack, podcast on enterprise tech and  Vice President at Chi Corporation

Follow @Knieriemen

Picture 211 The 25 Most Influential People Tweeting About Cloud Computing14. Zoli Erdos

PeerIndex: 63

Editor, publisher at CloudAve and Enterprise Irregulars. Erdos is also a startup advisor and Program Chair at SVASE (Silicon Valley Association of Startup Entrepreneurs)

Follow @ZoliErdos

Picture 25 The 25 Most Influential People Tweeting About Cloud Computing15. Randy Bias

PeerIndex: 60

CTO and Co-Founder at Cloudscaling, a cloud computing consulting firm

Follow @randybias

Picture 271 The 25 Most Influential People Tweeting About Cloud Computing16. George Reese

PeerIndex: 62

Founder and CTO of enStratus Networks, founder of Valtira and O’Reilly Cloud Author.

Follow @georgereese

Picture 281 The 25 Most Influential People Tweeting About Cloud Computing17. Simone Brunozzi

PeerIndex: 61

Amazon Web Services Technology Evangelist for Asia Pacific (APAC), read his personal blog here.

Follow @simon

Picture 301 The 25 Most Influential People Tweeting About Cloud Computing18. Joe Baguley

PeerIndex: 61

CTO Europe at Quest Software

Follow @JoeBaguley

Picture 291 The 25 Most Influential People Tweeting About Cloud Computing19. Denise Dubie

PeerIndex: 62

New Media Principal at @CAInc, editor/writer/techie focused on IT management, automation, service assurance @CAsvcAssur

Follow @ddubie

Picture 311 The 25 Most Influential People Tweeting About Cloud Computing20. Jeremy Geelan

PeerIndex: 58

President & COO at Cloud Expo, Inc., Chairman at 21st Century Internet Group, Inc, Media Advisor at Kaazing Corporation and Founder at Web 2.0 Journal & Green Technology Journal

Follow @jg21

Picture 36 The 25 Most Influential People Tweeting About Cloud Computing21. Rod Trent

PeerIndex: 64

Global Social Media, Community Manager at 1E and CEO, Owner at myITforum.com, Inc

Follow @rodtrent

Picture 32 The 25 Most Influential People Tweeting About Cloud Computing22. James Governor

PeerIndex: 65

Principal Analyst and co-founder at RedMonk

Follow @monkchips

Picture 33 The 25 Most Influential People Tweeting About Cloud Computing23. Stephen Foskett

PeerIndex: 61

Foskett Services, community organizer at Gestalt IT and File System Storage MVP at Microsoft

Follow @sfoskett

Picture 34 The 25 Most Influential People Tweeting About Cloud Computing24. Sam Johnston

PeerIndex: 63

Technical program manager in the Site Reliability Engineering team at Google Switzerland

Follow @samj

Picture 35 The 25 Most Influential People Tweeting About Cloud Computing25. Riitta Raesmaa

PeerIndex: 67

Entrepreneur, Founding Partner at Sopima. You can read her blog in English and Finnish.

Follow @raesmaa

Don’t forget you can follow how the Top 25 changes over time via our PeerIndex group and do let us know if we missed one of your fave thinkers on cloud computing in the comments.