Update: As the day has progressed, more people have experimented with Bing, and those who were already experimenting with it have experimented more. Not surprisingly, there have been flaws discovered. More criticism has surfaced.
While, Bing is techincally still in preview status, I have to assume they felt it was pretty much ready for prime time. After all, scheduled launch was only two days away anyway. Anyhow, here are a couple more articles on Bing observations worth looking at: