WordPress 2.6 Release Candidate 1 is now available. We think this is ready for release on Monday.  Try out RC1 and tell us if you agree.  New since Beta 3:

• Media uploader and gallery improvements
• Image caption and image editing fixes
• Press This fixes
• Ability to toggle between the flash uploader and a regular browser uploader
• Notification bubble on the Plugins menu when plugin updates are available

See the full list of changes since Beta 3.