Popular UIs is a new collection of Web interfaces recreated with pixel-perfect precision in Photoshop.

The site currently houses UIs from Rdio, Heroku, GitHub, Designer News, Apple and Facebook, although the contributors behind it say more PSDs will be “created every week” — you can sign up for updates at the bottom of this page.

Here’s a sample to pique your interest:

rdio ui 730x398 Detailed PSDs of some of the Webs most popular sites? You can download them here

MailChimp already threatened Popular UIs with legal action for their recreated UI (which has since been taken down). Hopefully other companies don’t follow suit, as these are a great tool for learning about and experimenting with successful UI designs.

Get ’em while they’re hot:

➤ Popular UIs