>The defining moment of E3 2010? It was dapper Don Mattrick at the Microsoft press conference announcing that everyone in attendance would receive a free Xbox 360 Slim. We shrieked like guests on Oprah–myself included (I know!)–then went home and wrote very nice things about Microsoft–well, most of us wrote nice things–and waited patiently by our mailboxes for our shiny new Slims to arrive.Looking back, this moment was not the act of largess it appeared to be at the time, but rather Microsoft’s diabolical way of slipping the media and the industry at large a collective mickey. Slims-for-everyone made us…