I know its german and all, but its quite funny.
That site lists the top10 of everything you can think of, and thats a list of best goal celebrations:
http://www.zehn.de/das-menschliche-fahrrad-2331608-1
On the left you see the 10 points you can click, in the middle on the bottom you can click then the videos of the celebrations.
Some really funny ones there.
I liked Ruud van Nistelroys celebration :p