Ummm, GlennZilla---if you're offering, I for one would love to see you do tutorials on anything and everything PS related. I'm totally self-taught (usually by trial & error), so anything you'd like to do would be much appreciated.

I'm with RP that Channels would be cool to know (masks I have a decent handle on, but still...). I do almost nothing with them. I also almost never use the pen/paths options, so if you could show that it would be cool too.

If you do decide to make tutorials (please please please), then it would be great to see it used on a map, of course, so we can see the application in action as users of this site would most likely find important and applicable. Just an idea.