it's the same like the masks in PSP. You can save a mask to an alpha channel (or a selection) But I have to work more with that when creating a skin. Coz you need alpha channels if you want to have a glass effect over your display, for example.

yep I'm trying WA3 aswell. Nini and I started with it almost at the sametime :D. it's really cool to do. (loads of satisfaction when you figured out something)

see my sig for a link