Forbes reports:  In the last (pre-drinking) session at the D: All Things Digital conference at the Terranea resort in Rancho Palos Verdes, California on Wednesday, we heard from  Marc Andreessen, co-founder of venture capital firm Andreessen Horowitz, and founder of Netscape and various other tech start-ups. Chatting him up: Walt Mossberg and Kara Swisher. Perhaps the biggest takeaway from the session: Marc ...