This would be an interesting deal -- rumor has it (that crazy rumor always has something, doesn't it?) that Apple may start selling subsidized MacBooks in the UK, with O2 including the notebooks with their wireless plans. Quite a proposal -- the idea, of course, would be for O2 to pick up a subscription by offering a discount on the already (relatively) cheap $999 MacBook. This plan has been rumored for a long time with iPhones (and I still believe it'll happen eventually), but with mobile broadband subscriptions on the rise, O2 and other services might start giving kickbacks on notebooks, too.
Of course, whatever discount you saved early on would cost you in the end with the continued cost of the broadband subscription. Which makes this deal as unlikely for people to buy into it as it does for Apple to agree. But you never know -- analysts especially are leading the call for cheaper and cheaper MacBooks, and a subsidy might be just the thing (even if it isn't actually popular with consumers) to push the MacBook down to around the $800 price where stockholders want it to be.