YourFonts is a free web-based service that turns your handwriting into a font. All you have to do is download the PDF template, print it and fill each box with your own hand writing (or anything else, come to think of it...oooh, the possibilities!).
Then you simply scan and upload the file to the website - YourFonts turn this into a TrueType font instantly for you to download. I had a quick go myself, as you can see above. It definitely seems too be a useful and fun resource.