Sorry if its a repost, but I came across these vids today and thought they were for the most part pretty informative.
http://www.youtube.com/watch?v=Id4fvyus ... re=related
http://www.youtube.com/watch?v=eW_TWULk ... re=related
http://www.youtube.com/watch?v=FBOhcVG4 ... re=related
http://www.youtube.com/watch?v=jybWpEN- ... re=related
http://www.youtube.com/watch?v=jybWpEN- ... re=related
http://www.youtube.com/watch?v=RUOHCtGQ ... re=related
http://www.youtube.com/watch?v=2qypaNYI ... re=related
http://www.youtube.com/watch?v=EWW3eXgS ... re=related
http://www.youtube.com/watch?v=oLVHzx4V ... re=related