try to read the webmaster guidelines of Bing and optimize your website - http://www.bing.com/toolbox/blogs/w...9/03/search-engine-optimization-for-bing.aspx
I have seen Bing advertising on TV and daily on radio in the U.S.; seems they're trying to make a move by encouraging people to use their search engine. Especially from mobile phones with internet access.
I don't get much traffic from Bing. I guess it depends on your target audience. If your visitors are more technically-inclined, don't bother with Bing.
On my most popular site, Bing is responsible for just 1% of the traffic. But even though it's an insignificant amount of traffic, visitors from Bing seem to view far more pages, stay on the site longer, etc.
Once again from the replies above one can see that Bing is nothing and probably wont ever be. Google is king of the hill and I doubt anyone will knock them off anytime soon. Concentrate of Goog, that is where the real money is. Bing is just loose change.