I paid $400 to get my capture card from a Japanese AUCTION 1.5 years ago (It was lying in a box for a half-year until I could afford to make a computer to put it in). It covers the bases like 480p, 720p, 60fps, widescreen detection, and stuff, but it's only sold in Japan, requires Japanese D-Terminal cables, requires TOSLINK optical digital audio input, and the software/menus are only in Japanese (my WinXP is running in Japerneze mode), and I knew enough Japanese to surivive the whole purchase/installation/usage process. (yes, it was a gamble)
The only other card that does 480p-Component and is in the CONSUMER end of the market is
http://www.leadtek.com/eng/tv_tuner/overview.asp?lineid=6&pronameid=399It's mostly found in Euroland at the moment, for abour 45 Euros. I don't know anyone who has it, and the reviews I found were not helpful. I do not know if it will display/capture 60fps, has video lag, or if it detects/ignores widescreen images.
If it detects widescreen properly, then the TV window should be wide like this
http://ssv.vgafix.com/misc/vidcomp/re4_cut8.html(or include a widescreen viewing option)
If it doesnt detect properly, the window will look like this
http://ssv.vgafix.com/misc/vidcomp/re4_cut7.html(cuz the picture is like this in reality; widescreen televisions do the extra step of stretching it to the proper ratio)
... in which case, when running the TV tuner program on your computer, you have to stretch your TV window horizontally to get the proper effect -- but there's a small chance the window won't allow independent stretching between the horizontal and vertical dimensions.