We're using the Apache Jenkins build server for continuous builds.
Trunk build - This build is set up to check SVN for updates every 30 mins.
Linux build + stand-alone TCK + deploy - This build runs every 4 hours (5 minutes past the hour) on the Ubuntu build agents (two servers which are heavily used and may take more time between runs) and includes JUnit testing, the TCK in standalone mode and deploys the SNAPSHOT artifacts to the Nexus repo.
Email notifications to commits@bval.apache.org.html are generated by Jenkins for build failures (and when builds return to normal).
If you're interested in the Jenkins services or would like to request an account on the server, check out the Jenkins wiki for more information.
