I'm also using a Mac (my PC had a heart attack) so I'm learning how to use this thing as well.
Most of the makeup I'll play with will be mineral/loose eyeshadows bought from indie mineral makeup companies. I believe you get a much better colour payoff for a much better price than if you were to buy from the big name brands. I will still use what I have (some Urban Decay, MAC etc) to make my everyday looks, but the majority of the products used will be from Aromaleigh, Fyrinnae, Meow Cosmetics and the list will grow as my collection grows!
Right now you can check out my photostream at www.flickr.com/pa1nt3d_AxSDenied for some of my eyeshadow looks
Since the PC is dead, I have to find a new photoshop to resize my pictures :(