It's a sad day indeed when childrens TV is funnier than adult comedy. But CBBC's Horrible Histories consistently out ha-has anything on adult sketch shows at the moment. B3TA just ran a little article on it too so I thought I'd mention it.
Here's a taste if you've not seen it. http://www.youtube.com/watch?v=YjeqRHdBwkY http://www.youtube.com/watch?v=_aNc5ijaHYs
Also look out for Sorry, I've Got No Head. Again, really, really strong material.