Structural Integrity of Laptops?

d_m_i_t_r_i asks: "As a laptop-toting college student, I'm very interested in just how much abuse my laptop can stand up to. Just how many pounds of books can I stack on it? How hard can I bang the corner, before it will cave in? Things like that. Does anyone review the cases of laptops for their structural integrity? Are there any sort of statistics out there of things like strength tests, dropping from a height, etc?"