If you want to learn weathering, then Cranky's the guy! Although that isn't a fair statement. There are alot of stellar modelers here at weathering, he's just the one I think of first. Most of the guys here are really cool and are willing to share thier knowledge. If you see something you're curious about you could pm them, but if it's a thread here, just ask on the open board and we can all benefit.
I guess what i'm saying is, don't hesitate to ask any questions. There are always a dozen or more guys willing to give you thier thoughts. What you'll come away with is several different techniques to try and you can settle on what works best for you. It's the diversity of the board that I love.