I finally buckeled down and created a tutorial for siggies on the Siggy Site. It is long merely because it's VERY thorough. But it details how to link a pciture as your sig and how to make it clickable as a magelo link.
If you want to learn more about manipulating fonts, try reading the first post on the Muck Thread.
Siggy Tutorial
Siggy Tutorial
Moderator: BatMonk