I used two fonts. The bold face font is TF2BUILD, the smaller font is TF2professor. You can get those fonts (and others) in your \team fortress2\tf\resource folder.
This is so weird. I was in CIM class today (we have a CNC mill!) and I wanted to engrave some TF2 text on some stuff. I googled for the font download, and got this thread, but at the time it hadn't been bumped since 2008. I return home, and blam, here it is on the front page.
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