Red vs Blue is a fun, somewhat science fictiony show available on the Internet for free … in low resolution. Season 5, their final and most polished season is available here.
I would recommend clicking on a link to an episode, then downloading the low resolution .WMV or .MOV file.
The Previous Episodes link takes you to a rolling archive, where they make 4 - 5 old episodes available at a time (also in low resolution). Currently they are making their way through season 1. Nowhere near as polished, but fun and you can see where it all started.
If you are interested in buying the series, you can do so here though I'm not sure if that's US region and/or PAL/NTSC.
Note: I am not associated with Red vs Blue; I am just now a fan of the series. :)
Warnings: Animated violence, some strong language, sexual innuendo …