Here is the cluster map of this page. Wow, you can see where did you friends come from in such a visual way. I have been waiting this gadget to open register for long long time, util I find it reopen and renamed to ClusterMaps. I registered my own account, and this tool can show a thumbnails of world map, annotated with points. Each point presents how many ppls visited your site from the location it is placed.
You can see it from my right panel. 
I love the transparent term window title, border, menu and taskbar (taskbar v2 from kde-look.org). They make the whole desktop a art works.