As previous poster said BitTorrent will deliver, but if you don't want to install the Torrent app, or would rather not be identified in your downloads, there's a host of other sites where you can download directly using 'right click/save as'
Excluzive.net has a good range of films and music, the files are hosted on fileshareing sites which can be tediously slow to download unless you subscribe (£10 a month paid by SMS text). Oh I should point out that it's in Russian, but even if you don't know the lingo, it's pretty intuitive to navigate around.
However once you filled up your hard disk, you'll have a mixture of different formats, and some files may be compressed, WinRAR will unpack them for you, but make sure you have all the necessary drivers for the wmv, avi, DivX, mov, asf etc formats. The K-Lite Codec pack is pretty inclusive