Well now, isn't this nice? British Telecom has come out with a sweet and loving promise to subscribers who partake in its current broadband and landline telephony bundles -- stick with us, says BT, and we'll upgrade you to our fiber (or fibre, as the Brits call it) optic network free of charge. Of course, this wouldn't be BT if there weren't some gnarly details to the bargain, which include 40GB a month usage limits and £25 setup fees for users on the cheapest monthly bundles. Still, at least the upgrade to 40Mbit is some