I did 3 outlets on each 20a circuit in the game room so I was sure I'd have enough overhead for 6 pinball machines on each circuit. There were two circuits where I cheated and branched off for a TV, but these days they pull almost nothing.
In the other areas, you can pretty much do a room per 20A circuit, but code in my area is no more than 14 outlets on a single 20A circuit. I ran another 20A just for all my GFIs. I started in the bathroom and then branched off from there over to the bar, so there are only 5 outlets on that circuit. That way I can put one GFI at the start of the circuit and it will protect all the outlets down the line.
I'm installing a theater and ran two dedicated 20A outlets for all the equipment and the projector.