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Great thread guys. A lot of topics touched on. Just a couple of quick points:
Light does "bend" due to gravity in the flat spacetime approximation suggested by our immediate experience, but in the spacetime of General Relativity, it merely follows the curvature of spacetime itself.
A body absorbing light will increase in mass, though the increase will be small. All forms of energy have mass; e.g., (all else being equal) a hotter body weighs more than a colder one, two hydrogen atoms have more mass than a helium atom (despite being made of the same particles), a moving car has (ever so slightly) more mass than a stationary one, etc...
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