While Google is all about keyword search, BlinkX is all about contextual search. Let me explain. Say you are reading through a big Microsoft Word document, on I dont know European Union policies on data transfer, the BlinkX bar at the top of the page, will retrieve relevant news item links with brief summaries (only visible when a mouse moves over the link) and other important links. At the bottom of the results a tiny ad which is in a color different from the results, so that you always know it is a paid advertisement. The software basically reads the entire document and builds a contextual link database on the fly.
It can do the same for a web page you are reading. For instance, if you were reading my piece on Cisco buying Procket, you would get links to all relevant news articles on the web, and links to Cisco and Procket homepages. However, the fun begins when you open the client software (which sits in the system tray.) It has a simple entry window. Lets say you put Napa and Sonoma County. It searches and brings back the web for news, Amazon for books, websites of relevance, e-commerce links and but more importantly any documents, emails etc related to that subject on your desktop.