MySQL 5.1.26-RC has been released today and is slated to be the last release candidate before we declare MySQL 5.1 as "production ready" (GA). We therefore appreciate any feedback and community testing of this release, to ensure that we have ironed out any remaining critical issues.
This one is still labeled a "candidate" release, so the usual hints about a pre-production release apply. The MySQL 5.1.26-RC release is now available in source and binary form for a number of platforms from our download pages at http://dev.mysql.com/downloads/ and mirror sites.
The change log can be found at http://dev.mysql.com/doc/refman/5.1/en/news-5-1-26.html. We welcome and appreciate your feedback, bug reports, bug fixes, patches etc: http://forge.mysql.com/wiki/Contributing