Whats a website that you can watch a movie without signing up?
There are several websites where you can watch movies for free without signing up. Some of them include Stagevu.com, Movieforumz.com and OVGuide.com. You can visit http://webtrends.about.com/od/profile1/tp/Watch-Free-Tv-Shows-Online-Full-Episodes.htm to see other sites.
tubeplus.com is my favorite
I use youtube all the time.. when i read your question that was the first site i thought of