Micah, I just tried BFR on my jailbroken iPhone 3GS 32gb.
Thanks for the app; very nice look and feel, better than Stanza, Goodreader or iBooks but I have the freeze problem when I leave the program.
Hope you find a fix soon.
What I would like to see is a clear indication of where I am in the book, always on screen (eg) a bar at the bottom or the top? This would, I think, be better than a page number and provide a better reading experience.
The other thing would be the ability to reduce the margins even further - even at the lowest setting, margins remain wide and the number of words on the page is still sometimes very small with some ebooks. (unless there is some other way of getting around this? Any advice very welcome.)