The main advantage with Epub over PDFs or other document formats is its ability to quickly and automatically adjust text for different screen sizes (although you can publish content in a fixed layout as well). It lets users change the font and text size themselves, and can accept GIF, JPEG PNG and SVG images.
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It’s also fully supported by virtually every e-reader out there except for Amazon’s Kindle, so you don’t have to worry about whether your PDFs are the right aspect ratio or if text will display correctly on you e-reader.
That said, if you do own a Kindle, a quick Google search will show you how to convert Epub to a compatible format.
Future Shakespeares can save their sonnets as .epubs by clicking File > Download as > EPUB Publication (.epub). The update is rolling out to all users over the next three days.
➤ Export Google Docs files as EPUB publications [Google Apps Updates Blog]