FontCapture.com is a cool new service that allows you to create a custom font from your own hand-writing. Simply print out their font template, write out the characters in your own hand-writing, scan in the sheet and voila – FontCapture.com spits out a font file that you can use to create personalized documents.
Check out this sample that I created using this service: (Warning – I don't have a great hand-writing!)
Bold font (made by filling out the template with a Sharpie)
Normal font (made by filling out the template using a normal pen)
And here is a preview of the font at different font sizes: