Fontifier
offers a simple (write and scan) and inexpensive ($9) method to create a personalized font based on your handwriting.
The seven step process requires a printer and scanner. You can create your font with up to four templates, allowing for different weights, italics, doodles, etc. Once you've uploaded it you can preview it prior to purchasing it. Each template or version costs $9. Fontifier produces a TrueType font which can be installed on both Mac and PC, and can easily be edited using FontLab or TypeTool.