We have one on cable TV: "Prevue tonight". At least in this market,
it's a really obnoxious thing. Half the screen is a schedule of shows,
the other half is a series of really loud, flashy, 10 second
advertisements (blipverts?). My TV doesn't go there in the first
place, but I know it's channel 59.
DSS has a much nicer version of a directory - interactive and all. The
ones I've seen don't carry ads, although I suspect that's an oversite.
BTW, cable TV sucks here but the cable modem is fantastic.