ICANN Registrars by Country

Here is the list of all ICANN accredited registrars by country on 2010-03-12 (information retrieved on 2010-03-14). For each country, another page will give the list of all registrars accredited in this country, with the list of TLD they handle.
You can compare this data with the list of countries of their web sites.
You can also get the list of registrars by TLD, or go back to the main page on ICANN registrars.