I just came across this blog today, Fashion Doll Shoes. It's got tons of great information for doll enthusiasts like me. You can even follow the blog on Twitter. It's all about the art of making doll shoes, both high heels (like for fashion dolls like Tonner) and flat-footed dolls as well, including some ball-jointed dolls as well.
I just browsed through some recent posts, and I was amazed. There are even YouTube instructional videos posted online as well. Anything and everything you could want to know about making doll shoes is right there! Amazing site!