90% + traffic still coming from Google. That being said, Bing will probably do well for sites in niches related to Windows, as most Bing users also own PCs vs Macs. A well optimized page does well in Bing because of the On Page relevancy it gives via meta titles/descrip/tags.
SMO is the place where you can see active participants. This is one of the reason for promoting your product through it.. Thanks, Nick.