The second beta of WordPress 3.1 has been released for your testing enjoyment.
As before, you should probably avoid using this on a live site, and make sure to backup your files and database before upgrading.
There are still a few known issues, but if you find any more, please feel free to discuss them with the wp-testers mailing list.
If you’re a plugin or theme developer, please test them for compatibility, as the final release of 3.1 is not too far away.
Have you tried the WordPress 3.1 Beta yet? What do you think so far?