After performing a search, Google lists the terms you searched for in a screen-spanning bar, which also lists the number of results and the time it took for the search. What I just discovered the other day is that clicking on any of those terms in that bar performs a search on the word at Dictionary.com.
Maybe everyone knows this already, but to me, it’s just another reason why Google is becoming a one-stop reference resource. The new Froogle site (currently in beta) is another reason. It is a subset of the Google database focused on products for sale. When the beta period is finished, it’ll probably be placed in the tab bar, along with “Images”, “Groups”, “Directory, and the terrific “News” search site. Now a single search can define a term, link you to pages containing that term, show you related images, provide you with the wide-ranging opinions available on Usenet, show you related categories of sites, news about your term, and — if your search was about a product — information about purchasing that item.