The Mailinator is a service that provides throw-away email addresses you can use for web registrations - similar to spam.la.
So the system ends up getting lots of spam.
Now here's the cool part: they've created a realtime map using Google Maps to actually show you where the spam is coming from.
Or actually it shows the location of the proxy - ie. the grandmother whose home computer was taken over by Mydoom, Bagle, Mytob or any of the gazillion other viruses that install spam proxies as their payload.