The IT Crowd is a more conventional sit com, but there is funniness to it. Matt Berry is really good in the second series. And I have a soft spot for Richard Ayoade.
I was not madly wowed by Darkplace. Oh, it's funny, but the mechanism that produces the laughs is so predictable. The thing I like about Boosh is its sheer oddness. There's also lots of very quick, nonsensical wordplay.