A tablet is a different thing from an e-reader. If you want to check your email, surf the web and listen to music then you don't really want an e-reader - you want a general-purpose tablet. Personally, I can't see the point of going for a half-way tablet like the Fire, but they are relatively cheap, so that's a factor I guess. Regarding formats: Kindle (AZW), KF8, TXT, PDF, unprotected MOBI - These are text formats. Kindle books are usually AZW. Without the copy protection, they are MOBI. I'm not sure exactly what KF8 is. TXT is plain text, and PDF is Adobe Acrobat format. With Kindle, you don't get EPUB. DOC, DOCX - these are microsoft word formats PRC natively - I'm not sure what this is, either. JPEG, GIF, PNG, BMP - these are picture/photo files, as used on web pages, for example. Audible Enhanced format (AAX) non-DRM AAC, MP3, MIDI, PCM/WAVE, OGG, WAV - These are audio file formats, other than MIDI (although MIDI files are usually used to generate music). M4V, MP4, AAC LC/LTP, HE-AACv1, HE-AACv2, MKV, AMR-NB, AMR-WB - I don't recognise all of these, but I think they are video formats. HTML5, CSS3, 3GP, VP8 (WEBM) - these are hypertext markup formats used to make web pages.