“This tool is used to optimize CSS.” I ran it for Lockergnome (Before 8529; After 7323; Saving 1206) and for this very site (Before 15718; After 12822; Saving 2896). I can't see any visible differences in the browser(s)! By far, this is the best CSS optimizer I've ever seen or used. It oughta be mandatory for anybody who's serious about Cascading Style Sheets.