Love this one, honestly: in an Office 2003 document – i.e. Word, Excel, PowerPoint – hold down the Alt key and click a word. This will lookup that word in the Research pane, which includes a Dictionary and Thesaurus.
The only downside is that I’ve had this app for over two years now and I’m still finding new tools within it…
Mighty slick! Now to waste time in Outlook rewording an email so my boss understands that “it doesn’t work.” and wont ask questions anymore…