This TV Guide iPad web app is one I now use on a daily basis. The listings are formatted nicely for the iPad, making it easy to find when the next episode of your favorite show is on. You have to setup your location/cable provider, but it will remember next time you return. Features include ability to set favorite channels, sort by category, show only HD channels, and check out what shows aired yesterday.

For people like me who have canceled their cable and access broadcast TV with an antenna, they probably miss the TV guide that's built in with cable. Using the TV Guide web app, I found the switch to free broadcast TV to be a lot easier. The HD broadcast where I live in Portland is amazing quality (better than Comcast) - and now I might actually know when shows air.