There is an excellent television site which includes a complete listing of the entire history of comedy. Well, I can't actually say for sure that it is but, and as far as I can see, there's a whole darn lot of shows included including clips.

And the site is: http://www.tv.com/shows.html

The trouble with TV.com is that it is predominantely American (hey, isn't everything?), so although there is some good stuff on there, it's not always entirely useful. Or, in my experience, reliable.

But still quite a collection!