I wouldn't want to put a map between a man and his motorcycle, and I've heard all dirt roads in US lead to Vegas, so one just follows the dry riverbeds.
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RevolverMaps - Free 3D Visitor Maps
How about this free app that says who is currently on the site?
I don't think that's useful. Applications like this just collect the IP addresses from where pages are loaded and then reverse lookup them in a geolocation database.
You need something that interfaces with the forum software so that it can assign screennames of active members to the map. Otherwise it's just a map with bunch of pointers showing where the site pages are downloaded from - who really cares about all those spammers from india, china, brazil, russia, etc. that are hitting the site all the time.