I love this ‘reference library on demand’. You install a client on your computer that allows you immediate (with a broadband connection) reference information. Clicking on a word or phrase in any Windows program triggers GuruNet and submits the underlying text, returning facts about the topic. The New York Times called it “the best implementation yet of the information at your fingertips promise.” There is a free client that is plenty powerful but you may want to buy a full license after you try it. If you do, write me for a coupon that will give you $5 off. Yes, I know, this is a blatant advertisement for what is essentially a multilevel marketing scheme — after I sell five people on licensing it using the coupon code I provide them, I get my own registration fee refunded to me. Privacy-oriented readers may be concerned that GuruNet tracks your queries and shares aggregate (but not personally identifiable) usage patterns with third parties such as their corporate clients and third-party content providers. Nevertheless, I think the tradeoff is worthwhile if you are a heavy text-based computer user who ever needs to look up a word or a fact.