WordPress version 2.9.1 fixes some bugs of version 2.9
After the realease of WordPress version 2.9 last december a new version 2.9.1 was quickly released on Jan 04, 2010.
This release fixes some minor issues as well as a rather annoying problem causing scheduled posts and pingbacks not being processed correctly due to incompatibilities with some hosts.
If any of these issues do affect you, you can give 2.9.1 a try by downloading it from the wordpress.org site or by upgrading it automatically from the Tools->Upgrade menu in your WordPress blog’s admin area.