I've had a Fuji Instax Mini instant camera for about a year now and I love it. The only drag is ordering film on Ebay from Japan. The larger Instax film has been available from a few outlets in the US, but not the mini.
I saw today that B&H Photo in New York is accepting orders for Instax Mini film, at a price much cheaper than Ebay! I am SO stoked. They'll be seeing a big order from me soon.
If you haven't played around with an Instax Mini, they are a lot of fun. They are great at parties and kids absolutely love them. I think it's a great way to get kids into film-based photography, creating the idea that photographs can be individual works of art, not just infinitely-copyable bits.