Finding wireless connection signal strengths

Hi

I often need to move my laptop to find the best wireless connection signals in my room.

Is there any tool available that visually shows in which part of the room, the wireless connection signal is the strongest, so I can direct my laptop in that direction.

Thanks

net stumbler is pretty good and graphs the signal strength as you move around....move around the room, letting it log, to find the "best number" and then watch it as you move to hit that number again..