I'm surprised nobody has mentioned IntelliAdmin's Remote Administration For Windows. It comes in two flavours, multi-LAN and intra-LAN
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Enterprise Remote Control - $599 US
Enterprise remote control allows you to connect to computers from anywhere. If it is on the Internet, you can get to it. Best of all, there are no monthly fees, and no third party network - you run it all on site.
Remote Control - $199 US Per Administrator
Take control of computers across your network, or across the world. Remote Control allows you to control a PC as if you were there. Includes a blazing fast search to find computers quickly
