Calibre - free software for managing eBooks and synchronizing with the PRS-505. Available for Windows, Mac, and Linux. Update: this thing is great! By far better than the included Sony software - and together with Adobe Digital Editions, you can easily buy your books from Thalia and transfer them to the device without any problems. Due to the DRM on books from regular sources, you need to use Adobe Digital Editions for reading (and probably for downloading as well), but otherwise you can fully use Calibre as a replacement for the somewhat cumbersome Sony software.