Drew Wilson has introduced a new service ($19–$99/year) which allows designers to create custom icon fonts from his Pictos collection. It’s crazy simple: Pick your icons, assign to letters, and embed the font live, ala Typekit, or download the file for a small fee. Brilliant.
Also: if you need a little convincing as to why you would want to use a webfont for icons, check out this excellent article on CSSTricks.