Most Helpful Guys
Most things by Louis Theroux are pretty good. I also like Ken Burns, his recent doco series on Vietnam was very good.
Something thought provoking and philospohical.
So a good conspiracy i can learn a deeper meaning from, philosophical material such as how the maker thinks the universe works, spiritual ones about near deaths for example, etc.
Most Helpful Girl
I love murder and crime documentaries, especially when they include hilarious dramatizations. I also love "mystery" documentaries where they detail odd situations they no one can explain: mysterious disapperances, odd locations around the world, etc. That's pretty much the other documentaries I watch.