lol, yes he is (until he meets me of course).
Neil says he had never denied being gay but issued a sort of "official" coming out statement in 2006 after he was targeted by Perez Hilton.
http://www.people.com/people/article/0,,1554852,00.html

Neil has been in a relationship with actor David Burtka (Scooter on HIMYM) since 2004.

I hate to say this but he is