This thread is dedicated to cool/useful geek stuff. Post what you think would be cool to have.
Here's a couple I've seen:
Driving LED Emoticon - It just needs a remote....

http://www.thinkgeek.com/gadgets/electronic/8e9a/
TV-B-Gone - Useful for having peace and quite.

http://www.thinkgeek.com/gadgets/electronic/755e/
Extreme Range WiFi Router - I might actually buy this for work...

http://www.thinkgeek.com/gadgets/electronic/9d54/
Bluetooth Laser Virtual Keyboard - Cool for on-the-go typing.

http://www.thinkgeek.com/gadgets/cellphone/8193/
Giant Swiss Army Knife - Not really practical but still cool.

http://www.thinkgeek.com/gadgets/tools/8b97/
Here's a couple I've seen:
Driving LED Emoticon - It just needs a remote....

http://www.thinkgeek.com/gadgets/electronic/8e9a/
TV-B-Gone - Useful for having peace and quite.

http://www.thinkgeek.com/gadgets/electronic/755e/
Extreme Range WiFi Router - I might actually buy this for work...

http://www.thinkgeek.com/gadgets/electronic/9d54/
Bluetooth Laser Virtual Keyboard - Cool for on-the-go typing.

http://www.thinkgeek.com/gadgets/cellphone/8193/
Giant Swiss Army Knife - Not really practical but still cool.

http://www.thinkgeek.com/gadgets/tools/8b97/