Would be great if we could put an address into an event and and you could click to map the location. I searched but couldn't find anything.
Have you looked at the mods Google Map and Google Member Map? They might do what you want. I don't know if they take an address, or only transfer .kml data over from the Google map site. Google's map site has an API of some sort -- maybe you could stick the map in an <iframe>?
I really can't see this being a core feature that would be useful to even the majority of users that use the calendar (and that's precious few as it is)