Burnsy - on the opposite side of the spectrum (from TC's structuralist formalism) there's some Kuchar lurking about on YT as well.
If structuralism is more your thing, there's always Martin Arnold ( and Peter Kubelka's got stuff floating around, too.
Or, if you're into people who are more contemporary, there's the epic awesomeness of Michael Robinson who I'm addicted to despite myself:
And if you've got time, its worth checking out Ryan Trecartin's five-part youtube extravaganza A Family Finds Entertainment