I use GIMP for graphic design and I've downloaded a lot of my own fonts. GIMP shows every single version of every font on Windows, including foreign ones, so I went into my registry and deleted all the fonts I thought I wouldn't use.
I still have many of the basics: Veranda, Lucidia Sans & Lucidia Grande, Trebuchet MS, Arial, I wouldn't delete those, but now my iTunes looks like this:
I know a re-install might solve this problem, but does anyone know of an individual font that iTunes uses as their menu/sidebar font??