Updated 080908: The root server operators have a map of their own that I recommend. There is also an XML version of the data so anyone can make a map of their own.
I still meet people that think the following is true:
All of those statements, and similar, are just completely wrong. You can find more information about the organisations that run the root servers here, and find a map I have done at Google here.
Updated: Got information about a server existing on Fiji, and found on the homepage of Autonomica [I] that servers also existed in Kathmandu and Luleå. If you know more servers missing, just let me know (for example via a comment to this blog).
Updated 071123: Edna Samudio gave me information that F has a server in Panama since July 17, 2007. Information about the server can be found here.