I love the Propellerhead Sound Design Micro Tutorials. The latest explores Malström, a synth designed by Magnus Lidström (of Sonic Charge fame) back when he had a day job with the Props:
"Malström is a one-of-a-kind synth, begging to be explored. In this tutorial we'll learn the basics of this mean green machine by creating a synth pad sound from scratch. And once you've got a feel for what Malström can do, endless sound design possibilities are just around the corner!"