There’s going to be a patch sprint of sorts for 3.0 this week. Please grab a ticket, triage, patch or test: http://core.trac.wordpress.org/report/32. The feature freeze is March 1, so everything still on that report in 7 days from now will be punted to a future release.
There are a few incomplete tasks out there that need to get done to finish implementing new features (both small ones on that report, and the major 3.0 features). If you’re interested in helping but aren’t sure where you can, venture over to #wordpress-dev.