Anyone know if this thing is any good? or maybe a site with a review of it.

From Website:
The online gaming revolution is here with the Wireless Net Extender. Connect your PlayStation®2, Xbox® or PC to the Internet without wires for real-time online game play without complicated cables or software installation. You don’t even have to change your settings. Two small, sleek cubes connect your existing DSL or cable modem to your game console without running wires through your house, upstairs/downstairs, or through walls, even if the Internet connection is 100 feet away from your PlayStation®2 or Xbox®. Your connection will be secure and without interference thanks to RF technology. The Wireless Net Extender is also compatible with all routers, which have built-in Ethernet ports. Enjoy lag-free, online gaming, whether you’re playing your friend next door or across the globe.

Features:

Eliminate bothersome cables and socket restrictions
Plug and connect, no software installation or changes to settings required
Matched and coded pairs allow multiple Wireless Net Extender sets to be used in the same household or office
Unique pairs ensure secure interference-free connection
Allows for wireless connection to the internet
Plug and Play for easy use, no technical skill required
Encrypted secure communications
100-foot range ensures connection from any room in the household or office

I have a pair of these and they seem to work fairly well. I got them on sale for about $60 several months ago and haven't had any trouble with them. If you are looking for something quick and simple this is probably the way to go. But if you have to pay full price (around $90 I think) and are somewhat computer savy you might consider going with a wireless router/NIC/access point. It will offer a lot more flexibility without costing too much more.

IGN Review
It sounds like a pretty good solution, especially for the price