Some comments under the Ajaxian banner:

Firefox 2: Client-side storage and a lot more
Which Ajax approach is right for you?

Lookup address of US phone number on a map, with a call option

Lets you locate a phone number on a map and call it via your VOIP provider.  Toll free numbers are excluded. Cell phones are located by state/town.

Tested with: Firefox 1.5.01 (requires GreaseMonkey 0.6.4 plug-in) and IE 6.x (requires Turnabout plug-in @ http://www.reifysoft.com & simple edit of their config.xml)

Less effort - More fun - Enjoy!