I've just discovered that when I register my airmail with SingPost, I can actually track it when it reaches the US, via USPS at http://trkcnfrm1.smi.usps.com/PTSInternetWeb/InterLabelInquiry.do!

Could this be a new feature? I do remember trying to track something last month and coming to a dead end once the item had left this country. But now I know exactly when buyers have received their stuff, even if they don't leave feedback.

How cool is this! It's not offered for every country, only the likes of USA, Canada, a few around the region, and some European countries (and the UK is not on this list! why?!).