If you are actively using Sitemeter as your analytics tool, then you should receive a message from them by now. You can now get a free Sitemeter Premium account for one whole year by signing up with Microsoft adCenter.
All you need to do is register for an Sitemeter + adCenter account, activate it using a $5 one-time non-refundable activation fee and get an additional $50 of free clicks for your adCenter campaigns (you will need a credit card for this).
Offer is only until July 31, 2007. Fine print states though that you can only avail of the $50 credit if you live in any one of the 50 US States. *bummer*
P.S. Maybe you could ask someone (relative or friend) in the US to sign up for you and use the $50 free credits yourself?