The only outstanding failure on Hudson I am currently seeing is:
PagingFailoverTest::testMultiThreadFailoverOnProducing
If you run this test in a loop a few times it's easy to get it to fail.
I already ran it for 100 times... the test sends a lot of messages.. .so it takes some time to get that many runs.. and I never got a failure.
Perhaps it would be easy at the revision the failure happened?