Which one do you mean? The font of 0.2.8.3 (alpha) and below is actually just three images,
font_s.png,
font.png and
font_extra.png (note: they're white on transparent background, so you probably won't see anything in your browser)
The font used in 0.3.0 and higer is an actual font (
TTF download). It was modeled after the original font.
Edit:
Two screenshots with the TTF font.