A really, really good sit-down pizza place, and so much better than Papa Dels (that's sacrilege in C-U, but it's the truth). The thin-crust pizza is fantastic, and reasonably priced. My girlfriend and I normally order either a pineapple pepperoni or a bacon pepperoni (sometimes half-and-half) and it's fantastic. I also love the atmosphere; I don't play pool, but the building is gorgeous (I'm a sucker for the tin roof) and the place is lively.
The garlic bread isn't really worth it, and the beer selection is kind of lame (all the domestic Big Three bottles you can drink!), which keeps it from five stars, but I like Jupiter's a lot.