A release candidate is the final stage between beta and final release, and the development equivallent of “we think we’re done.” Over 700 tickets have been resolved so far, and only a few have shown up in the last few hours.
The final release of WordPress 3.1 is just around the corner, so it’s time for both developers and users to take it for a spin and try it with your favorite plugins and themes.
If you run in to any problems, please feel free to discuss them in the Alpha/Beta section of the Support Forums or contact the wp-testers mailing list. If you run in to any bugs, please follow this guide to report them.
Have you tried WordPress 3.1 RC1 yet? If you have, what do you think so far?