Bing/MSN can be slow to index, but the traffic has been picking up significantly and it is well worth the effort and wait. Excellent results also from their PPC - lower CPC and much higher conversion rates (less junk partner traffic) than Adwords and Sponsored Search.
Bing bot is very slow on picking up and crawling the site. I thought they are working hard to bit Google. Even you submit on Bing webmaster tool still you need to wait hundred years to crawl the site.
In order to make it a bit faster go for the sitemap pinging. Otherwise, the quality of their traffic is really much better - always with a lower bounce rates !
I submitted my site two weeks after Bing was launched and I was indexed within two days. I guess I had some luck
Bing is the slowest search engine i have ever seen.My site took around 3 weeks to get indexed by the bing and for google it took around just 2 days.What a difference there in bing and google.