Visit Hulu.com, which began as a joint partnership of the corporations behind NBC and Fox. Both studios also owned an archive of movies, and the site does have a healthy library of titles. Hulu has fine streaming speeds, but it only shows partial movie clips for free, and will not have the newest releases. Users can see the full movies if they subscribe to Hulu. In 2011, the cost was $7.99 per month.
Check crackle.com. The site claims to stream movies and TV shows "free and uncut." The selections are also not the newest films available, but as of 2011 it did work.
Do the free trial at Netflix. Netflix, which is best known for renting movies by mail, also has an online service. The free trial runs for one month. After the trail, the service is available for $7.99 a month.