Well, another thing I did under 2007 was to change the fonts for the whole system. I haven't got around to this yet in 2008.

Basically, you can just edit the default theme in /usr/share/themes/ (this is different in 2008 which uses a link to the theme directory).

So just copy the theme you like, link to it and then edit the theme. You change the font name in the theme file (gtkrc in the gtk-2.0 directory) and and delete the .cache file for the change.

Like I said, I haven't messed with all this in 2008 yet, so poke around a little.