I just installed two nice add-ons, both Google map related. Both are incredibly simple. The first allows you to highlight an address on a web page, right click and map it with Google maps. Simple, but something I do all the time.
https://addons.mozilla.org/firefox/1886/
The second is even more useful. Same concept but you set your home address (and optionally two other addresses) and when you highlight an address on a web page you can right click and get directions from your home to that address (supports either Google or Yahoo).
https://addons.mozilla.org/firefox/1104/
To me these show how sometimes the simplest little addition to functionality can make all the difference.
Steve Fischer's Random Blog 
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