Ahh I adore Whose Line! I have series 1 & 2 on DVD. I agree that the British version had more charm (Clive Anderson does get slated a bit, but I found him to be the better host), although I did also enjoy the US version (especially since Ryan Stiles and Colin Mocharie were mainstayers. I love those two!). I don't really think its classed as a panel show, but it is definatly a great comedy program. We even did our own spoof version of it called "Aah I Forgot My Line" on the first year of my university course.

I have seen quite a few episodes of Would I Lie to you, and I do enjoy it, although not as much as some other panel shows.

How about Argumental? I have quite mixed opinions on this one. Some things brought forward can be great and i'll be laughing my arse off, but sometimes I find it rather annoying or unfunny.

@Nightmare Cloud: I wouldn't call forgetting things 'Thread Fail'. Everyone forgets, and doing a thread on comedy panel shows is just pure win to me!