Hi All,
Finally, after a two month long beta process, I've released calibre 0.6.0. It has tons of new features and bug fixes, some of which you can read about here
http://calibre.kovidgoyal.net/new_in_6
A big thank you to all the calibre code contributors, translators and beta testers, without you, this release would not have been possible.
Now that I have 0.6.0 out of my hair, I should be going back to the one release per week development cycle you've come to know and love
There is also a nice video tour of calibre at
http://calibre.kovidgoyal.net/downloads/videos/
Enjoy!