The big don’ts are the same for all three of the major search engines. They all frown upon things like keyword stuffing, paid link schemes, and sites that are thin on content but thick with affiliate links. Stay away from these things, and all three of the major search engines will reward you for it. Yahoo! and Bing tend to place a little more emphasis on the age of your site than Google does, but in every case, being an older, more established site is an asset and not a liability.

Fortunately, you don’t have to apply SEO to your site with your Yahoo! hat on, then with your Bing hat, then with your Google hat. Best practices for SEO work for all three, and if there are smaller tweaks you want to employ to make your site more palatable to Bing or Yahoo! there’s no reason not to.