Several ways of turning your handwriting into a font.
Your Fonts Free and all done online.
Fontifier Also done online, but for $9.
Acro Type Another online place, for $10.
Quantum Enterprises Costs $15 but takes a few days.
Font Garden Costs $40, and also takes a few days.
TypeTool (by the makers of FontLab); with a student discount it is only $54.