A great piece of kit and it comes cheap(only $19.50), you can buy it from www.adafruit.com, here is what they say about it:

TV high range remote control the TV-B-Gone Kit

“A great piece of kit and it comes cheap(only $19.50), you can buy it from www.adafruit.com, here is what they say about it:
Tired of all those LCD TVs everywhere?
Want a break from advertisements while you’re trying to eat?
Want to zap screens from across the street?
The TV-B-Gone kit is what you need! This ultra-high-power, open source kit version of the popular TV-B-Gone is fun to make and even more fun to use. This version is best used in countries with NTSC: North America & Asia.
This kit comes with all parts necessary. Tools and batteries are not included. This is a very simple kit and great for people who have never soldered anything before.
Power: 2 AA batteries (not included)
Output: 2 narrow-beam and 2 wide-beam IR LEDs
Number of TV power codes: 46
This covers pretty much every TV of the following brands, including the latest flat-screens and plasma TVs
Acer, Admiral, Aiko, Alleron, Anam National, AOC, Apex, Baur, Bell&Howell, Brillian, Bush, Candle, Citizen, Contec, Cony, Crown, Curtis Mathes, Daiwoo, Dimensia, Electrograph, Electrohome, Emerson, Fisher, Fujitsu, Funai, Gateway, GE, Goldstar, Grundig, Grunpy, Hisense, Hitachi, Infinity, JBL, JC Penney, JVC, LG, Logik, Loewe, LXI, Majestic, Magnavox, Marantz, Maxent, Memorex, Mitsubishi, MGA, Montgomery Ward, Motorola, MTC, NEC, Neckermann, NetTV, Nikko, NTC, Otto Versand, Palladium, Panasonic, Philco, Philips, Pioneer, Portland, Proscan, Proton, Pulsar, Pye, Quasar, Quelle, Radio Shack, Realistic, RCA, Samsung, Sampo, Sansui, Sanyo, Scott, Sears, SEI, Sharp, Signature, Simpson, Sinudyne, Sonolor, Sony, Soundesign, Sylviana, Tatung, Teknika, Thompson, Toshiba, Universum, Viewsonic, Wards, White Westinghouse, Zenith
Max distance: At least 100 ft!”