If you were wondering what the real differences are between the new Sony Alpha D-SLR semi-transparent mirror cameras (the Sony SLT-A65 and Sony SLT-A77), here is a summary made in pictures.
It may help better understand the differences justifying the very large price gap between the two models (for the same digital sensor).
Pictures coming from a partnership with Sébastien Ortega-Dubois who gives more detailed differences in a comparison of Sony SLT-A77, Sony SLT-A65 and Sony Alpha 55.