eBook Library is the replacement software of the Sony Connect, and it is currently being shipped with the new Reader PRS-505. Sony promised that it would also be available for download for PRS-500 users soon, but so far no luck.
Well, until now.
Through some ingenious detective work I discovered the direct download URL of the setup program:
http://download.sony.com/prs/ebookli...0Installer.exe
No idea what's new, but I hope you can enjoy it.