Nancy Zeiman has done us a huge favor with these videos. Novice to advanced, there's always something new to learn. I was pretty impressed with each of these 26-minute videos from various artists:
"Tried and True Sewing Tips"
http://wpt.org/SewingWithNancy/Video...-tips-part-one
http://wpt.org/SewingWithNancy/Video...-tips-part-two