Norbert Tretkowski recently worked on packaging MySQL 5.0.67, the latest Community Edition release of MySQL Server. But, since the next Debian version - Lenny - is already frozen, the packages were not uploaded to the official archive.
Instead of that, I rebuilt them and made them available on Dotdeb for Etch amd64/i386.
Please take a look at the official Changelog before upgrading and thank Norbert for his good work.