Telling it like it is

From OChef.com, a practical, helpful, no nonsense answer to a question about using superfine/caster sugar. "If you fail in your search and your store manager wouldn’t recognize customer service if he tripped over it, you can make your own superfine sugar by running granulated sugar in a food processor until powdery. After you turn it off, let the powder settle for a minute before you open the food processor. Otherwise you’ll be snorting sugar dust."

Lot's of other good things too, this looks like a great site. Finding superfine/caster sugar