WordWeb

There are lots of programs for the PC, the Palm, and other platforms that make use of Princeton's WordNet database, turning it into a dictionary (which isn't what it was meant to be, but still ...). Of all the Windows ones, I like WordWeb best -- and it's free. It lives in my system tray, and I use it for quick word lookups.

(In case you didn't know, "sawyer" means: 1. One who is employed to saw wood, or 2. Any of several beetles whose larvae bore holes in dead or dying trees especially conifers.)