Build completes just fine on my local machine, and examining the output of the failed build (for example, here: http://geo.openplans.org:9090/continuum/servlet/continuum/target/ProjectBuild.vm?view=ProjectBuild&buildId=1387&id=156) has no errors in the logs that I can find.
Any ideas? Justin, can you see where the build error is in that link?
--saul