PatrickDeese - 7:37 pm on Jan 20, 2005 (gmt 0)

The only diffrence between his site and mine are the geographical location of the visitors

That is the most likely explanation.

I have a site that is available in 3 languages, English, Spanish and French - the EPC breaks down something like this:

English = 1
French = .5
Spanish = .25

That's because there is different adwords inventory for different countries and languages.