Google drives at least 95% of my traffic. I'm alway in the top 3 slots on Bing and Yahoo, sometimes being #1, and still don't get the traffic I get on Google with a 7th slot on the first page. On Google I do seem to be hovering on the 2nd page, 1st slot and can't get to first page on many keywords, and that's aggravating.
bing is just a new especially for my forums he won't get anything cuz he doesn't have much pages on his index
They are about the same for me, but you have to realize just to googles size -- Bing traffic will peak. I have a new site so while Bing peaks google will continue to ramp up.
So far, Bing has given me better results. I still use Google, however, to get a different "view" on the same search term. So both are still very useful for me, and both still provide good amounts of traffic to my Website.