Hey everyone, I guess I was really trying to find some pointers on how to do this type of picking.

http://www.youtube.com/watch?v=F9UKNwlhhpo (Starting at about, 18 seconds in)

I guess my real question is, what the **** is this called? Is it alternate picking? Because you are technically alternating between up and down strokes, but it's the string skipping while palm muting that's throwing me off. I can play this all down stroked, but it really tires me out, 30 seconds into the song.

In a nutshell, what practice techniques will help me most in improving this picking style?

Yes, poop.
Practice palm muting the low string, then hitting the high string(s) with an upstroke, it should be cleaner, as you keep your pick "outside" the skipped strings (so the strings in between are less likely to be struck). I don't know if this is helpful or not.. It's just how I think about it.