Hi,
this looks interesting.
Presuming that the tool isn't some kind of browser add-on, but a plugin for a webpage, I imagine that it must have the capability to grab some paragraph text from webpage, parse and "intelligently" highlight some important words... is that it?
So yes jQuery is the way to go, though I prefer native javascript for implementing it. May I know more clearly about your own idea and where do you plan to apply it on? The latter is quite important to me as I only have one time experience implementing a plugin for Wordpress page and it's a bit more complicated than implementing a plugin for regular webpage.
Kindly let me know...
Hendra D.