In case you are wondering, there is WordPress 3.0 RC2 but it is only for internal use.

Download: WordPress 3.0 RC3

Here are some new features of WordPress 2.6:

• Post Revisions: Wiki-like tracking of edits
• Press This!: Post from wherever you are on the web
• Shift Gears: Turbo-speed your blogging
• Theme Previews: See it before your audience does
• Word count
• Image captions under your image
• Bulk management of plugins
• A completely revamped image control to allow for easier inserting, floating, and resizing. It’s now fully integrated with the WYSIWYG
• Drag-and-drop reordering of Galleries
• Plugin update notification bubble
• Customizable default avatars
• You can now upload media when in full-screen mode
• Remote publishing via XML-RPC and APP is now secure (off) by default
• Full SSL support in the core, and the ability to force SSL for security
• You can now have many thousands of pages or categories with no interface issues
• Ability to move your wp-config file and wp-content directories to a custom location, for “clean” SVN checkouts
• Select a range of checkboxes with “shift-click.”
• You can toggle between the Flash uploader and the classic one
• A number of proactive security enhancements, including cookies and database interactions
• Stronger better faster versions of TinyMCE, jQuery, and jQuery UI

2.6 is pretty much identical to 2.5 from a plugin and theme compatibility point of view, so upgrades from 2.5 should be pretty painless. The 2.5 branch will no longer be maintain so everyone is encouraged to upgrade.

» Download WordPress 2.6

PS: The current version of my plugins should work well with WordPress 2.6 except WP-DownloadManager. Nevertheless, I will release updates to all of them tomorrow.