Visited with the folks at OliveTree whose BibleReader program resides on my Dell Axim and is the program I use to have the Greek and Hebrew texts in my hand. One thing I've appreciated is that, as I've migrated from an old Palm III back in the day to the Dell Axim running WinMobile 5, I have been able to transfer over the books I have purchased. Check out their support for the various mobile platforms including iPhone, iPad Touch, Blackberry, Android, WindowsMobile, Palm OS, and Symbian. They anticipate providing support for Windows Phone 7. BTW, they do also have the SBL Greek New Testament with apparatus available as a free download.