Text Wielder is a native Mac OS X program that will let you do things such as search for text on your favorite search engine, check a stock quote, track a mail package, or clean up those messy email quotes all without ever leaving the application your in!
How does it work? Text Wielder takes advantage of a Mac OS X feature called services. Services allow you to select text in any services-enabled application(e.g. Mail, Stickies, OmniWeb, TextEdit) and send it to another application, like Text Wielder, for processing. Text Wielder knows how to use the text you provide to it to do things like opening your browser and getting a map for a zipcode or looking up a word on an online dictionary. Text Wielder can also modify and return the text you send it which means you can do things like re-wrapping paragraphs.