The discovery of Web 2.0 service Frappr is interesting. A portlet with this data would be cool.
Check out Frappr http://www.frappr.com
<script> var frappr_mapheight = 300; var frappr_mapwidth = 300; var frappr_maplat = 48.86; var frappr_maplon = 2.34; var frappr_mapzoom = 13; var frappr_host = "http://www.frappr.com/";var gid = 643734;</script> <script src="http://www.frappr.com/ajax/mapwidget.js"></script>