I have been seeing a weekly increase in Bing traffic. The y! seems to average. I have seen a SLIGHT decrease in google (and I mean slight) since traffic for most of my sites seems to be up a bit this last month.
Well, this is explains why, the techcruch statistics shows that bing is getting more and more visits by time.
as of this month's stats it got 9.3% of market share ! and keeps going up.
Till now, bing & yahooo together are sharing aprox(30%) of global search visits, google has 65% and the rest of engines have 5%.. so i guess that is the right time to start optimizing for both of yahoo & bing... things will not last forever for google.