GoWatchIt tracks all the major sites (Netflix, Amazon video, HBO Go, Hulu, iTunes, etc.), along with DVD, Blu-ray, in theater, and on demand. Add shows you want to watch to your queue and GoWatchIt will email you when your show or movie is available.

As an example, I wanted to watch The King of Comedy (very obscure Martin Scorsese, Robert Di Nero movie), but it never seemed to hit on cable. Just got an email that it is showing on Starz. DVR set. Would have missed this. Thanks, GoWatchIt.