Don't download movies, watch them on a web-site I go to =).
All you need is Greasemonkey (Firefox Add-on), install their Megaupload script, and than you download DivX web-player.
Just make sure you download the older version as the new version wont work with some movies.
Link:
www.icefilms.info
All movies and shows are in DivX quality, so it is always good.
They have almost any movie you can think of as well as TV show. If they don't, you can request it on their forums.
You can also watch your TV shows within an hour or two of them being aired on television.
I've been on this web-site for over 3 years and have never been disappointed.
If you decide to use this website and need help, PM me and I will gladly help. They are also have a support section where you can find a bunch of tutorials on how to watch movies on their site.
EDIT: BTW, I do not make any money or benefit at all from you going there. I just recommend the site I use as it has always done me well =).