PCB that plugs into a computer's bus and enables NTSC and/or PAL television viewing on the computer. As the owner of one of these devices, I must say, they kick ass.

If you are looking for one of these devices, I have the Hauppauge WinTV PCI board that also has FM radio. It is well supported by Linux kernel 2.2 and higher (perhaps lower?) via modules bttv.o, tuner.o, and msp3400.o. You also might want Xawtv which you can find at freshmeat. The Hauppauge TV tuner cards are sold at my local Comp USA, and you can check out the manufacturer's webpage at www.hauppauge.com.