Now this is cool.
Go to Gvisit and you can register, and get a one-line JavaScript that can be put onto a web page, and their server will be able to tell you where your visitors are coming from!
My last 5 visitors came from:
- New York
- Bern
- Seattle, Washington
- Melbourne, Victoria
- Adelaide, South Australia
I’m guessing the last one was me 
The free service will only track the last 20 visitors, the paid-for one will do up to 100.
(Thanks to Jake for this one)
I really is a cool service. Thanks for the credit!
2 hours, 44 minutes after the fact.