Here are some intersting links on how to anodize aluminum. Some people with lathes may be intersted in having their own parts anodized.
<A HREF="http://www.warpig.com/paintball/technical/anodize.shtml" TARGET=_blank>
http://www.warpig.com/paintball/technical/anodize.shtml[/url]
http://www.focuser.com/atm/anodize/anodize.html
The second link has lots of nice pics.
Have fun!