http://download.moodle.org/
Note that Beta means "feature complete but not stable yet" (though it's stable enough for moodle.org to run it). There's also a few things in the works that are not included yet - more later on this.
It's still on HEAD for a while, to make bugfixing easier. I'll branch off a MOODLE_19_STABLE soon.
What we really need now is for you (especially those of you with larger sites) to try upgrading non-production sites (perhaps copies of your production sites) and send in your feedback either to this forum or (better) in the form of bug reports to the Moodle Tracker.
The main thing you'll be wanting to look at is the new gradebook, but see the release notes for all the other new things:
http://docs.moodle.org/en/Release_Notes#Moodle_1.9_Beta
Thanks for your help!
