MySQL Labs provide server snapshots
By Giuseppe Maxia on Aug 20, 2009
MySQL opens its labs to the community. Users who want to test the early builds, before they are released for general availability can get them from MySQL Labs.
There is a detailed announcement that warns against using these binaries in production, but encourages everyone to test them. A companion tutorial explains how to use the snapshots to test the InnoDB plugin, which was released recently, and it is included in the latest MySQL 5.1 binaries.