I have a [link|http://www.linksys.com/Products/product.asp?grid=33&scid=35&prid=415|BEFW11S4 - Wireless Access Point Router with 4-Port Switch].
One of the owners of RTRON(where I work) also has one and had distance issues(he's got a huge home). We ordered the [link|http://www.linksys.com/products/product.asp?grid=33&scid=38&prid=478|WSB24 - Wireless Signal Booster] for him. I took it home to test it before we sent it home with him. It made all locations inside my house have full 100% signal strength. Before various locations would drop down to a "marginal" reading, 2 bars(out of 5) on the strength guage. I even tested outside my house and found the coverage radius increased by 50 or 60 feet.