Pretty, and a worthy addition to the list for side projects and quick prototyping for things where I don't have budget yet.
For projects for actual business (your employers' or your own), I suggest investing in getting design a little more specific to the actual customers' needs than most stock free icon sets. This one, for example, would be grossly inappropriate for my non-technical customers, who are not yet up with the reflections on top of reflections Web 2.0 aesthetic. (I got my icons for them from http://www.icons-icons.com two years ago on sale for $25 and its probably the best $25 I ever spent in my life.)
For projects for actual business (your employers' or your own), I suggest investing in getting design a little more specific to the actual customers' needs than most stock free icon sets. This one, for example, would be grossly inappropriate for my non-technical customers, who are not yet up with the reflections on top of reflections Web 2.0 aesthetic. (I got my icons for them from http://www.icons-icons.com two years ago on sale for $25 and its probably the best $25 I ever spent in my life.)