Another thing you can do is work with a provider in your area that has 2
pops. In Boston, for example, BBN has a Cambridge Pop and a Boston Pop.
Their highest service level brings a T1 to each. Presumably, only one Pop
would suffer a catastophe that wouldn't be suffered by other providers as
well.
Of course, the lines run side by side through the customers building and
into the street, so we are still subject to the limitation that our
construction workers carry saws and don't know how to splice fiber. 
--Dean