I run the following all on one outlet w/power bar and only plugging in one thing into the spare outlet;

Computer
Modem
Printer
HD Cable Box
DVD Player
Receiver
Plasma TV
Computer Sub-woofer
Wireless Router

I've had no problems as of yet, but I was thinking of using another power bar from another outlet to unload that outlet a wee bit.

Receiver: Yamaha RX-V2200
Main: Axiom m80
CC: Axiom VP150
Surround: Axiom QS8
Sub: SVS PC13-Ultra