http://spaceflightnow.com/shuttle/sts114/040220tank/

Here's another interesting bit from the above article:

The foam that doomed Columbia tore away from the so-called left
bipod ramp, an aerodynamic wedge of insulation covering the fitting
used to attach one of the shuttle's two forward attachment
struts. The ramps, in place to prevent ice buildups on the
attachment fittings, have been eliminated in favor of electric
heaters.

So the fix here is to eliminate the "aerodynamic" bipod ramp and
replace it with heaters to prevent ice formation.

This is interesting to me, because my first impression of the bipod
ramps was that they looked insignificant in terms of drag reduction
(the reason they were there in the first place). This is part of a US
philosophy that places a high value on the aerodynamics of launch
vehicles, even though they spend little time in the atmosphere.

By comparison, Russian launch vehicles have attributes that make US
aerodynamics engineers cringe.

Jeff
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