Good gadgets for computers?

Question

what are some good gadgets you can add on to your computer. so for example getting freeview through your pc or other fun stuff like controlling your house lights through the pc

Answer 1

The 'Magic-Jack'  is interesting for phone calls.

Answer 2

Fingerprint reader rocks. Don't have to remember dozens of passwords anymore.

Answer 3

USB coffee warmer or one of those missle systems you can aim at people in the office.