WordPress 3.1.2, was released on April 26, 2011 and is a maintenance & security release.
This release addresses a vulnerability that allowed Contributor-level users to improperly publish posts.
We suggest you update to 3.1.2 promptly, especially if you allow users to register as contributors or if you have untrusted users. This release also fixes a few bugs.
WordPress 3.1, was released on February 23, 2011 and is a major release that adds:
a redesigned linking workflow which makes it easy to link to your existing posts and pages
an admin bar so you’re never more than a click away from your most-used dashboard pages
a streamlined writing interface that hides many of the seldom-used panels by default to create a simpler and less intimidating writing experience for new bloggers
a handful of backend updates that plugin & theme developers will enjoy which also increase WordPress’ content management (CMS) capabilities
WordPress 3.1.1, was released on April 5, 2011 and is a maintenance & security release that addresses about 30 minor issues. Upgrading is recommended.
WordPress 3.0, the thirteenth major release of WordPress and the culmination of half a year of work by 218 contributors, is now available for download (or upgrade within your dashboard). Major new features in this release include a sexy new default theme called Twenty Ten. Theme developers have new APIs that allow them to easily implement custom backgrounds, headers, shortlinks, menus (no more file editing), post types, and taxonomies. (Twenty Ten theme shows all of that off.) Developers and network admins will appreciate the long-awaited merge of MU and WordPress, creating the new multi-site functionality which makes it possible to run one blog or ten million from the same installation. As a user, you will love the new lighter interface, the contextual help on every screen, the 1,217 bug fixes and feature enhancements, bulk updates so you can upgrade 15 plugins at once with a single click, and blah blah blah just watch the video.
WordPress 2.9.2 was released on February 15th, 2010 as is a security release.
Thomas Mackenzie alerted us to a problem where logged in users can peek at trashed posts belonging to other authors. If you have untrusted users signed up on your blog and sensitive posts in the trash, you should upgrade to 2.9.2. As always, you can visit the Tools->Upgrade menu to upgrade.
WordPress | Upgrade Guru | April 27, 2011 | 
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