Their webmaster tools seem to be working for bing only....
The dofollow links from their forum give good backlinks to your site. This helps in all of the search engines.
WM Tools
Webmaster Center - Bing
Forum
Bing Community
Bing seems to follow some of Yahoo and some of Google for rankings.
Some SERPS match exactly with Google and others match very close with Yahoo. Others I cannot even find a placement for me on their SERPs.
I hear "relevant" backlinks are a major key. But who knows? I do know that they are slow to index pages. This was even mentioned by one of their developers. He also said that they will eventual index Every page of your site, just at a much slower pace than the other SEs.