bog, I read:
i'm looking for some TV tuner card with good and stable relationship to pd... usb prefereble.. linux should be great... thanx
generally all those bt878 based tv tuner cards (hauppauge, miro) work well with pdp or gem under linux bu these are pci based.
I have successfully used a hauppauge wintv usb under linux (and at least one other person on this list has this working too). The two remaining problems with usb tuners are 1. the linux driver doesn't support the compression of the device yet (i.e. low framerate <10fps usually) 2. even if compression would work it's cpu intensive and still not as good as full pal video via pci.
see also http://usbvision.sourceforge.net/ and http://www.emuit.com/webcam.html
HTH
x