Stylish or Chicken Scratch, Your Handwriting as a Font. The NY Times had a little article on Fontifier.com's service. The site started last November. I wrote about making your own fonts in Linux last June, through the use of pfaedit.
Pfaedit's site has a very good manual/tutorial on developing your own fonts -- for those of you wanting to see for yourself the process undertaken in creating a font. If you think the process is too time consuming, perhaps the $9 fee at Fontifier is well worth it.