WordPress 2.9.1 Release Candidate 1 is now available because the recent 2.9 release triggered a bug in certain versions of PHP’s curl extension.  With these versions of curl, scheduled posts and pingbacks are not processed correctly.  To fix this problem as well as a handful of other, lesser issues, WordPress Dev Team Members are quickly releasing 2.9.1, the first maintenance release of the 2.9 line.

RC1 contains a few more fixes, bringing the number of fixed tickets up to 23.  If you are already running Beta 1, visit Tools->Upgrade in your blog’s admin to get RC1.  You can also  download the RC1 package and install manually.