Kamikaze
I really liked the extensive SWA videos over Groove3, a lot more detailed and the way Karl goes through each element discussing how to set each part up to suit your needs I found far more thorough than Groove£. The SWA was for x2, but it's virtually all still relevant. They have a new Sonar Platinum series started too.
Karl is FastBikerGuy on here on the forum.
ugh, dangit, I had Streamworks and G3 there until I rewrote the sentence and left it off.
I usually add G3 to the suggestions because they have several good "outside the box" tuts, general recording, theory, etc., and better than Lynda etc.
SWA has the best software specific vids I've seen, and the ones on Sonar are available from the CW store.
And Scott Garrigus for his Power series of books on Sonar.