Nice! We still do cash bonuses and such, but I've started doing things like keeping the fridge stocked with soda(I've kept it stocked with gator & powerade for years) and also chips, peanuts and other snacks.
It goes further than money I think. Everybody really appreciates it. It's cheaper than them going next door to the vending machine and spending $1 on a coke.
Small gestures like this really help cement a team I think. Face it, you are around the people you work with more than your family. You may as well enjoy them.