Clicker is much more than an aggergator, it's a full TV guide, but I'll focus on it's search capabilities. You can search for both movies & TV shows. When you reach a TV show's page you see availability data for each season and episode. Clicker supports many streaming services, check the table at the bottom for a full list. Unfortunately, Prices are not shown, you can only see on which service the title is available. There is no mobile web version for the site but there are apps for iPhone and Android which show availability on iTunes or Google Play.
This is an iOS only service, available for iPhone & iPad. You can search for movies & TV shows. Most of the popular streaming services are supported (see table below). Prices are shown for renting and purchasing, but there is no distinction between HD and SD content. For TV shows, prices are available for whole seasons and for specific episodes.
Searching includes movies & TV episodes. Most of the popular streaming services are supported (see table below). Prices are shown, but there is no distinction between renting and purchasing prices or between SD and HD content. There is also no way to see the price for a full TV season. There is no mobile interface, Android or iPhone app.
You can search for Movies, TV seasons and episodes. Most of the popular streaming services are supported (see table below). Prices are shown for both renting and purchasing, as well as SD and HD content. There is a mobile interface but no Andriod or iPhone app.
Streaming Service Table
|Amazon Instant Video||✓||✓||✓||✓||✓|
I also created a Wikipedia article that summarizes this post in a comparison table and also added some missing streaming services to this article.