if you can stomach the crowds and the relentless flyering, you don't have to pay through the nose for comedy at the Edinburgh fringe. This site has loads of shows you can go to for free (just have to queue up to gain entry).
It's a bit hit and miss, but it's free so what do you expect? A couple of shows look really good e.g. Andrew Collins (of Collins and Herring) is doing a show for free, which is a bargain in my book!
Just thought i'd spread the word in case there were HUKD'ers planning on going up there and didn't know about it.