I know I just posted about an icon set the other day but upon stumbling upon Pictos I knew I'd have to do it again. The brilliance of this particular set (beyond the fact that they're well done icons) is that they're all contained with a typeface and, therefore, available to use with CSS3 @font-face markup. Granted, said markup isn't 100% available yet but it will be and having this tool at hand would be incredibly convenient.