Smeags on 19 May 2010
Does your wireless provider have a set number of devices that can access the internet at a time? I have Time Warner Cable and their standard set is 4 items per household. Of course with three laptops, a desktop, a DS, Wii, Xbox 360, and a BluRay player... something had to give. 
We called and set it to 12 items, so everything is good now.
