I'm currently working on version 2 of Classroombookings - making it easier to install, stamping out loads of bugs and implementing some nifty new features like LDAP authentication and better user permissions.
There is now a NEW new forum for discussion and a gallery of development version screenshots. If you're a fellow Facebooker you can show your support by becoming a fan. Don't forget to check out the project at Google Code as well to download the current version (1.0.0), submit bug reports and request new features.