X-fonter <http://users.pandora.be/eclypse/xfonter.html>
"Font Viewer, Font Manager and 3D Graphic Program
Now supports all font types (TrueType, OpenType, Postscript
Type 1, Raster, Vector)"
PS: Found my way to this little app by MS the other day,
<http://www.microsoft.com/typography/TrueTypeProperty21.mspx>
Not a font viewer, but adds a lot of extra info to the properties
window when you right-click a True Type Font, including Character
Sets/Unicode info. (not much more than X-fonter already shows on its
summary tab I think, but still - for when all one need is the info
and not a pre-view)