I have created a geocoding tool that shows off some of my learning. It will allow you to enter an address and get its lat/long coordinates. It also displays the lat/long coordinates of the centre of the map in case the address isn't enough. If you view the source, I have commented the more interesting bits.
The tool is a dumbed-down version of one that I am working on with all the Thunder Bay Community Services Agencies.
It takes 20 or 30 seconds to map the hundreds of addresses out of their database, assign different markers, set up the interactions, and display the results on three maps.