Metal font downloads for Gimp?

You can use pretty much any format with a recent version of X -- PostScript works, but so do the TrueType fonts that are standard on Win and Mac boxes. So you don't need special "Linux fonts" or anything like that, just get anything you can find. As for where to find metal fonts, well here is a decent place to start:

http://www.dafont.com/en/theme.php?cat=903&page=1

Dunno where exactly to find an Anthrax font, google it... I guess newer fancy distros have some sort of automagical way to install fonts, but if you want me to explain it the old-fashioned manly way, let me know.
 
OK, so say you have a .TTF file that you want to install

Firstly, move it into your TrueType font directory, usually this is something like /usr/X11R6/lib/X11/fonts/TTF or /usr/X11R6/lib/X11/fonts/TrueType

then, as root:

# cd /usr/X11R6/lib/X11/fonts/TTF
# mkfontscale
# mkfontdir

then, as your regular user:

$ xset fp rehash

...then you should be all set. If it doesn't want to work, try restarting X.