Been waiting for an ebook reader for my Blackberry and looks like this could be it! Version 5 (still beta) worked fine for me, and you're not limited to samples. Re-downloaded my wife's Franklin library of .prc ebooks after adding blackberry PID to her Mobi account profile, and all books work fine on my 7280. Only problem encountered was trying to read converted .txt ebooks - have an extensive library of .txt ebooks and tried using the Mobi Web Companion to publish to .prc format, but they don't load or crash when opening if they do. If anyone else has had more success, please post how you did it.