I don't think I have too much compared to the collections others might have. However, others here are likely older than my 21 years.
Several old VHS tapes, several current DVDs
Several books - Moe's autobiography, the Curly book by Joan Maurer, One Fine Stooge, the Stooges book by Michael Fleming, the Three Stooges Chronicles, the Larry book by Moe Fineburg, The Three Stooges: Triumphs and Tragedies....
Three Stooges wall clock
A few Franklin Mint Three Stooges plates
Talking heads of Moe, Larry and Curly. They utter a few lines if you bounce them.
A Moe "doll" from the late 80s
I'd really like to get my hands on an autograph of one of the Stooges - Besser, even - but they are NOT cheap. Too bad I wasn't born 10-20 years earlier as I could have gotten a few of them through the mail for nothing. Moe, Larry, and the two Joe's were very good with their fan mail by many accounts. Autograph collecting through the mail is actually a hobby of mine, though I mostly stick to baseball players.