Short Gimp Tutorial
-:- Official GIMP Manual w/ Tutorial
I also know that in the Linux version, you are able to download additional cursors, but according to the win conversion site, they don't have support for them.
Multi-image file support. For instance icon or cursor archive files (.ICO and .CUR files in Windoze)
The whole gimp to windows conversion took place because Tor Lillqvist couldn't get his scanner to work inside Unix ( no communication modules had ever been made ), he tried to reverse engineer his own scanner to work but then decided to port Gimp to windows instead. I'm sure in future releases they will put out the support, but the windows backing obviously doesnt have as much open source writers behind it as the unix side so who knows what an eta would be.