thekitchensink on 26 January 2009
http://www.vgchartz.com/forum/thread.php?id=57968&page=1
http://www.vgchartz.com/forum/thread.php?id=54619
Just by doing a quick search, there are two threads right there about PS3 owners on VGC who traded them in for Wiis. The first was on the front page just today 
So, in answer to the OP's question, based on this evidence alone, yes.
Could I trouble you for some maple syrup to go with the plate of roffles you just served up?
Tag, courtesy of fkusumot: "Why do most of the PS3 fanboys have avatars that looks totally pissed?"
"Ok, girl's trapped in the elevator, and the power's off. I swear, if a zombie comes around the next corner..."
