Downloadable dictionary

I've found a great downloadable dictionary that you can install to your laptop or PC and not have to be online to use. The personal edition is free, but for $20 you get the Pro version, which gives you fuzzy searches and stuff.

It's called WordWeb

One thing I like about this software that I haven't seen in any other software is its ingenious use of cross-referencing words and it's easy interaction with other software. If you're in Word and want to look up a word, just highlight it, and hit your pre-defined hotkey (by default Ctl+Alt+W). The little box pops up instantaneously with the definition, a list of close results in case you misspelled it, a list of synonyms, and "also try"s.

It's a great little piece of software to help improve your writing by letting get a better command of the English language (or any of their other downloadable languages :-)