When a country supposedly cooperative with us helps hide him, intentionally misleads us, and doesn't let our military in (officially anyway), it makes it a little tough to find the bastard.
And in response to that article...
What, you really think we should have accepted that deal? We don't negotiate with terrorists, period. And they'd keep on doing their crap had we taken it, that wouldn't have changed. Their deal was they'll tell us where bin Laden is if we stop bombing them and give them evidence that he was a BG.... oh man what a deal lol.