A free font by Matthew Welch
Tiny is, I believe, the smallest possible font (in pixel size). It stands at a lofty four pixels tall (five if you count descenders), yet it still contains all the printable ASCII characters. Presented here in TrueType format, you can print it out at any size you want, in order to make it actually readable.
I'll be back
Hooray for our side
Get the machine that goes 'ping'