The code is built for non-english and international sites - if you visit from the US, we show US-relevant ads, if you visit from Germany, we show german-relevant ads - and the matching is language agnostic.
But, inventory-wise, we have concentrated on UK and US adverts so far (with some German and Swiss adverts too). This is just a matter of time - getting hold of the feeds and importing them - rather than any technical issues.
Lastly, we can't deal with AJAX sites yet - but if the system can access the content that will eventually be shown (by doing the same GET as the AJAX request) then there is a way round it - rahoul@emberads.com if you'd like to know more. Getting AJAX working properly is something we have on our roadmap, but we've not had time to look at it yet.