Scoma's is an Italian seafood place in the Fisheman's wharf area. It's not on pier 39, nor is it in the real wharf area where Alioto's and all of those are. It is a little bit further toward Ghiradelli Square, actually only abnout a block from Allioto's, but then up a little street out toward the Bay.
It's the most wonderful seafood you'll ever eat. If you go after about 7 PM, plan on waiting at least an hour. The food is to die for. They have a website, but I guess its against the rules to put that here. You can google it.