The long awaited 2.6.0 release is finally out after an extended release process, which hopefully makes it a very stable release.
Beyond the RC11 there were a few minor changes that went into 2.6.0
Updated Icons
Fixed editing of primary groups.
Fixed group validation in consistency checker.
More checks for user deletion to prevent deletion of a user with an id of 1.
Safari & Konqueror browser workarounds.
Better error detection for MySQL dbs, where indexes may have different keys.
Fixed a bug that prevented signature from being appended to message posted to mailing lists & NNTP via the forum.
Proper conversion of HTML [quote] tags to plain text version for e-mail.
Added "Last Visited" to the user information page.
A much faster way for making PNGs Alpha transparent on IE.
Send Content-Length header for attachment downloads so that browsers can show proper progress indicator.
Better symlink wrapper for php < 4.3.2 for windows.
Fixed message navigator link in PATH_INFO theme.
Increased default font sizes.
Removed hard coded image sizes to allow for easier customization.
Slight optimization to message displaying code for topics with large numbers of messages.
Fixed handling of no filters on selmsg page.
Be more strict with URL parsing.
Increased SQ expiry
Fixed handling of attachments in private messages.
Make action field TEXT rather then VARCHAR
Make spell checker avoid numbers.
Fixed avg post calc for locales where decimal separator is a ','.