I wish I had seen this back in December, when I was looking for the best place to obtain a couple of Christmas movies. I hopped from service to service, trying to find the movies in question. Little did I know, but there is an easier way.
Can I Stream It is a web site that lets you enter a movie title, and then gives you a list of services where you can stream or download the movie, or obtain the Blu-Ray or DVD. The screenshot below gives you an idea of the kind of information the site provides. It is currently US-only.
I noticed one difference between the normal version of the site, and the version that loads on Safari on the iPad. The full version supports movies and television shows, while the iPad version only seems to support movies.
Popcorn thumbnail image on main page from shannashin at stock.xcchng