I am also wondering about the stock font. There are not enough screenshots available, (via the long press) this is especially irritating once a font change has been made, since all the fonts change to the currently flashed font.
Future suggestion, JRummy: keep the Font ROM fonts separate from the system font so we can see a preview when browsing for a new font.
anyway, I am still trying to figure out what the original font is or a way to revert to it easily in Liberty Toolbox. I will do more research and post here if I find something unless someone else can figure it out first.