Free documentaries online are a great way to find out further into current political topics as well as some interesting and educational videos.  The following 3 sites aggregate free documentaries and provide full length videos.

Bodocus – Documentaries in a wide variety of topics, like tech, science, drugs, business, environment, all streamed online for free.  You’ll full documentaries from quality sources like showtime, history channel, national geographic and the latter.

Docuworld – A large amount of documentaries that is constantly updating.  They have documentaries covering just about every walk of life.

freedocumentaries – the friendliest user interface and a lot of really good documentaries.  You can also choose the size of the video.