A couple of days ago I decided to make an map to show where Raspberry Pis were, the project is now complete 
The map so far has got 66 Pis (From the time of this post) and is constantly growing!
You can add your pi @ http://rastrack.ryanteck.org.uk, I have checked with the foundation about the map and they say it is fully ok.
I hope to see you add your pis!
- Ryan
