I have been looking into Yahoo!’s mapping service API this week (Google offers one as well). What they have done is opened up their mapping services so that you can display your data on their maps. I have created a example on Yahoo! that displays my upcoming speaking gigs. Kind of silly but it took me all of 15 minutes to put this together which is quite amazing. It is all driven by this little xml file.
I think this kind of thing could be quite useful for association meetings where you could develop your own custom map of the meeting and lodging facilities related to your event. You could even create a special map for VIPs with all the locations of special dinners and other invitation-only events.