Personally I love any celluloid medium pick for acoustic guitar, while on electric I MUST MUST MUST have the Jazz III Ultex. What about you???

I'm curious to know what everyone likes the best, and I'm particularly curious if anyone here has experimented with stone picks, felt, or real tortoise shell. I wrote an article a while back on all different types of guitar picks , and in the research process I was surprised to discover there are so many types of picks I've never used.

I guess I'm just too young and silly to know about all the really good stuff.