I've never watched any. Is there a #1 best one to start with?

They are actually podcasts/mp3's, but I loved the one about the chemistry of love (not listed above).  Oh wait...that was radiolab (http://www.radiolab.org/story/91744-this-is-your-brain-on-love/).The other one that stuck with me, as a Chicagoan, was the TAL on gangs in Chicago.  http://www.thisamericanlife.org/radio-archives/episode/487/harper-high-school-part-oneNot sure about the above, looking forward to listening to them on the train.

Thanks JP. Both radiolab on love and TAL on gangs of Chicago sound interesting.

I hope at least one of the 8 TALs at clickhole is worth your while.

chicago gangs was a high-water mark.  Also checkout the giant pools of money about the financial troubles last decade:

http://www.thisamericanlife.org/radio-archives/episode/355/the-giant-pool-of-money

http://www.thisamericanlife.org/radio-archives/episode/390/return-to-the-giant-pool-of-money

Thanks Matt!