David Finckel—cellist of the Emerson String Quartet—has compiled a series of one hundred videos on various aspects of cello performance. I’m a violinist and, speaking for the ones I watched so far, I found them extremely helpful and fascinating.
Cello Talks – The Comprehensive List
Even for those of you who don’t play a stringed instrument, I think you’ll enjoy seeing the craftsmanship in Finckel’s approach. Also, if you are new to the Emerson String Quartet, let me suggest you begin with their recording of the complete Mendelssohn quartets.