Originally Posted by MerLock
I agree that since Sony supports so many different file types, that it would be really awesome to browse and purchase books from other ebook stores.
The Sony doesn't particularly support a lot of different file types. It's an ADE device, like pretty much every other reader (except Amazon) on the market is, hence it supports ePub and PDF. It has rather limited support for plain text and RTF. That's pretty much it.