For TV guides, I just have a bookmark to
http://mobile.yourtime.com.au/tv (for Aussie TV. I'm sure there are plenty of sites for US TV).
For tracking shows, I use
MockDock (as my 'homepage') with TV Forecast installed on it. A brilliant little site that lets you add shows and it then tells you when they're on next (complete with a little episode synopsis and link to TV.com). Also I find that it displays the day the show is on in your local time (for example, Prison Break may be on the 24th in the US, but it displays on my phone as the 25th (as I'm in Australia). Very handy
