http://mysqlha.blogspot.com/
Mark Callaghan from Google on high availability MySQL.
http://ourdelta.org/about
OurDelta produces enhanced builds for MySQL, with OurDelta and third-party patches, for common production platforms. All the builds are freely available for download.
http://www.percona.com/percona-lab.html
Percona builds binaries that contain recent versions of the MySQL database server, plus additional popular patches not included in the official binaries from MySQL/Sun. Hat tip Morgan Tocker.
