I love geo visitors! Instead of just 24 hours worth of data, is there any way to make it save all the visitor locations and add a counter? That'd be really cool!
Even 24 hours of data is about 1GB worth of data right now (and growing) since about 2M people use it. So not only would it be a massive amount of data, but showing more than a few hundred pins on the map would overload your browser anyway...
Actually Geo Visitors is already running on 10 beefy servers behind 2 hardware load balancers... http://www.shawnhogan.com/2006/06/this-is-what-blade-servers-look-like.html