Haikus from Jane on her 39th birthday:
Practice makes perfect
is what they say about things,
but sometimes it’s not.In this case it is
not practice but refinement,
and then more testing.You can help WordPress!
Now: 3.1, beta 2
is here; needs testing.But! Remember this:
Only install on test sites,
as YMMV.
The second beta of WordPress 3.1 is now available!
For things to test, please review our Beta 1 release announcement. A list of known issues can be found on our bug tracker.
Already have a test install that you want to switch over to the beta? Try the beta tester plugin. Please test 3.1 on a test site, not on your live site, as interactions with plugins that haven’t been updated may be unpredictable, and we can’t predict (see how that works?) whether something will break or not… that’s why we’re asking people to help us test everything! 
Testers, don’t forget to use the wp-testers mailing list to discuss bugs you encounter. Plugin and theme authors, please test your plugins for compatibility.
Download the WordPress 3.1 Beta 2 now.