I recently acquired and watched this latest video tutorial
from Jeff Schewe and Michael Reichmann. I feel these guys are getting better and better at these videos: this is the best one yet, and I suspect darn near everybody on this forum will get considerable value out of watching this video. Even if you don't use Camera RAW at all, you're likely to learn a great deal about RAW data and what can (and cannot) be done with it.
I consider myself a pretty competent handler of RAW data, but I learned quite a bit while also benefitting from the overall review of the subject. This tutorial is—for obvious reasons—really Jeff Schewe's baby; Reichmann's role is mainly in steering and oversight. Also included is interesting interview footage with Tom Knoll, who explains "why things are as they are" in both Photoshop and ACR. The series costs $40 and runs about 8 hours, but it's chopped into 10 to 20 minute "bite sized" segments.
Plus, you get to hear Jeff Schewe say "poop load" at least three times. (The tension of self-restraint is etched across his face through the entire eight hours.)