Back in 2007, an Austrian by the name of Phil Strahl became interested in the case of the Zodiac. Having experience in the area of font construction, he applied his skills to the subject by crafting a set of fonts that mimic the Zodiac's handwriting. In particular, he created: Zipher - a font that recreates the symbols from the 340 cipher, Zanity - the meticulous hand-printing style of the Zodiac, and Zodiac - the killer's manic handwriting.
I've used the Zanity font to create a new header for this site. If you're so inclined, I encourage you to check it out.