On Monday, Blinkx will launch a verion of its app for the Mac. It includes desktop search functionality.
Mac versions are something that many other well-known desktop search tools (Google, Copernic, Microsoft, X1, Jeeves, etc.) are not offering at the present time. Details in the InternetNews.com article: Blinkx Brings Desktop Search to Macs. The full text of the Blinkx annoucement is posted on Searchblog.