I'm still looking for something which embeds a plain text file, keeping the formatting exact. So far they rely on outside services to work, or they don't work very well and then stop working and leave me with scrambled text. Doesn't seem like the new oEmbed will cut it either. HTML doesn't need to keep it's formatting.

If someone does know of something which would work (for ASCII art in a plain text file) I am @thatgrrl on Twitter.