The main principles of SEO are the same for all the big search engines, as are the no-no’s. Keyword-stuffing, paid link schemes, link farms and other black hat SEO techniques will get you punished in the same way all across the board, but if you want to undertake small tweaks to make your site rank better in a particular engine, there is no reason not to go for it.
...as Bing is still really in its infancy, we’ve yet to see the developments that will make it really different to Google. Some findings have started to emerge now, but it will take several more years and a further gain in search engine market share before anyone really has to consider optimizing sites specifically for Bing.
At the moment, as Google has been tweaking their algorithm for more than a decade, theirs is far more discerning and advanced because they’ve had more time to develop and tweak it. Therefore, if you have a site with good copy, appropriate keyword density, good PageRank and lots of quality inbound links that already ranks well in Google, it will almost certainly rank well in Bing as well.
Find out more: http://sixrevisions.com/content-strategy/seo-for-bing-versus-google/