Here's the latest update (27 servers as of today!):
http://goo.gl/maps/bDpIBNote: Don't expect 100% accuracy.
Thanks for the update. Nice map! Berlin has two servers BTW (eco-electrum.no-ip.org and electrum.no-ip.org). They look like one on the map, maybe you can move them next to each other like the Hetzner-Cluster
Sure, I'll try to fix it.