These are the actual tools being used to run MySQL at scale inside Google, not one-time sanitized copies. You can get them at http://code.google.com/p/google-mysql-tools/. The old tools and patches are still available in old/.
Thanks to the whole team for their work on these tools and especially to Razvan Musaloiu-E. for handling release code reviews. If you'll be at the 2011 MySQL conference, stop by my talk with Eric Rollins on automatic failover and Mikey Dickerson's on detecting data drift.