Did you see my response over here? I suggested that you use the ARC configuration: http://forums.cnet.com/7723-13973_102-590978/need-help-connecting-new-samsung-es7500/?messageId=5448707#message5448707
It just occurred to me that since my new Samsung ES7500 TV, by design, does not output 5.1 sound on optical out, there is no way I can watch my USB/Allshare and those streaming app videos (youtube etc) in surround sound!! Please correct me if this understanding is wrong but sounds like a big rip off.
Is there a work around? What about ARC, does it output 5.1 sound?