kwintv allows you to watch TV in a window on your PC screen.
It has more or less the same abilities as xtvscreen which is included in
the bttv-driver package, but it is based on Qt, a C++ GUI application
framework by Troll Tech,
and integrated in the K Desktop Environment.
The bttv driver supports several frame grabber cards based on a Brooktree Bt848 or equivalent cips like the Win/TV series by Hauppauge and others. For details see the bttv-driver homepage.