Wrist rests are great to avoid developing carpal tunnel. Check this one, specially made for Halloween:

Via geekologie.com.

I have to admit that it took me some time to understand what this gadget is for…
This is to protect your privacy (or hide your mess) when you’re participating in a video conference using your webcam.
Available from gadgetnation.net.

If you have cold feet, this one is for you. These boots will keep you warm, particularly if you put them in the microwave before putting them on.

Available from gadgetshop.com.

This two-part security system detects if you (or the 9 grams transmitter you carry) is within two meters of the USB receiver. If not, it locks the PC. Come back and it will unlock the PC.

Available from deviltronics.com.

Totally useless. There are no words…