I haven't checked it out just yet, but will when I have a spare moment. I'm hoping they'll do open lossless formats like FLAC (and open lossy formats like OGG) not just MP3 etc. It really bugs me that Amazon wont support EPUB on Kindle, and seems to be adopting an Apple-style lock-in policy. It'd be really nice to see format options "open up", both in the number of available formats, and in support of open formats. Given Google's involvement in open-source with Android, I think it would be in keeping to provide the option of open formats for music, ebooks, etc.