Fontifier is a cool online app that ‘turns a scanned sample of your handwriting into a computer font that you can use in your word processor or graphics program, just like regular fonts such as Helvetica.’

Very clever, very funky and free at the moment.

Update: Hmm, doesn’t seem to work for me at the moment and no response from the site. Perhaps best to just download a selection of generic handwritten fonts or even download your own Signature Font creation program.