As part of his research at Harvard Medical School, Jake Mandell has a nice online pitch perception test that you can do in about 5 minutes.
Jake says that "the test is purposefully made very hard, so excellent musicians rarely score above 80% correct."
I got 80.6% on my first try, but I think Jake is being kind in his quote above because that only places me in the 66th percentile.
UPDATE: Next day I did the test again and got 88.9% (92nd percentile). That's quite a big jump :-)