Bing Optimization - Which Factors Make a Site Rank Well With Bing

* Backlinks are of less importance. If you compare the first 10 results in Bing and Google, it is noticeable that all equal, the winners in Bing have less backlinks than the winners in Google. It is unclear if nofollow matters with Bing.
* Inbound anchor text matters more. The quantity of quality inbound links might be of less importance for Bing but the anchor text certainly matters more. Actually, since anchor text is one of the measurements of the quality of inbound links, it isn't much different. Get quality anchor text and you will do well in both Bing and Google.
* Link spamming won't do much for you on Bing. Since the quantity of backinks (even if they are of supreme quality) seems to be of less importance to Bing, link spamming will be even less effective than with Google.
* Onpage factors matter more than with Google. This is one of the most controversial points. Many SEO experts disagree but many also think that onpage factors matter more with Bing than with Google. Still, it has nothing to do with the 90s, when onpage factors were definitive.
* Bing pays more attention to the authority of the site. If this is true, this is bad news for bloggers and small sites because it means that search results are distorted in favor of older sites and/or sites of authoritative organizations. Age of domain is also very important with Bing – even more than with Google.
* PR matters less. When you perform a search for a competitive keyword and you see a couple of PR2 or even PR1 sites among the top 10 results, this might make you wonder. On Google this is hardly possible but on Bing it looks quite normal.
* Fresh content matters less. Bing looks a bit conservative – or maybe it just can't index sites that quickly – but it seems that fresh content is not so vital as with Google. This is related to the age of domain specifics and as a result you will see ancient pages rank high (but these ancient pages are relevant to the search query).
* Bing is more Flash-friendly. Optimizing a Flash site for Google is a bit of a SEO nightmare. It is too early to say but it looks like Bing is more Flash-friendly, which is good news to all sites where Flash is (still) heavily employed.