TV Guide Mobile
Without cable finding the right thing to watch on a limited amount of channels can be difficult and I have no idea what programs are on these days. So I open this app, see if anything worth watching is on (sadly, the answer is rarely) and plan my night accordingly. This app gives me all the television channels and let's me know what is on today, tomorrow, whenever so I can make a choice about my time.
Oh, and for those of you who are a bit more advanced television wise than I am, it gives you all the possible choices for television as well. Cable? Direct TV? Dish Network? FIOS? All options with this app (which is great for when I house sit!)
Well worth having if you ever watch TV, even if it is only occasionally.