What do you mean by that, "internal"? A PC-Card solution? To my knowledge, the AverMedia AverTV Cardbus...
http://www.avermedia.com/cgi-bin/produc ... ardBus.asp
...is the only solution for analogue TV, and then there's the SCM Mobile Terrestrial Receiver...
...for the DVB-T standard. I don't see any major benefits with those cards, though, as they protrude very much from the slot and thus have to be removed when the notebook is lugged around.
I'd always resort to a small and lightweight external USB2 solution, which can be used with a desktop PC, too. Have an eye on solutions that draw their power from the USB port and don't need an external power supply, however.
For analogue TV:
Pinnacle PCTV USB2:
http://www.everythingusb.com/hardware/i ... review.htm
AVerMedia UltraTV USB 300
http://www.hometheaterspot.com/html/rev ... php?rev=48
For digital terrestrial TV (DVB-T):
TwinHan VisionDTV USB-Ter:
One of the very few DVB-T USB boxes (if not the only one yet) without external power requirements, if I recall correctly. A detailed review (in German) with many photographs and even screen shots of the TV window can be found here:
http://www.alltests.de/hardware/reviews ... plus_1.php
Babelfish translation German->English:
http://babelfish.altavista.com/babelfis ... p&lp=de_en
Finally, here you got some links to further reviews: