Microsoft’s Search Engine Optimization Toolkit
Microsoft’s Search Engine Optimization Toolkit offers a detailed analysis of a website’s onpage SEO factors. Errors that are reported by the tool should be fixed by the webmaster as soon as possible. Violations or warnings on the other hand need to be analyzed more carefully to avoid over-optimizing a website.
Read it here: http://www.ghacks.net/2009/12/27/microsoft-search-engine-optimization-toolkit/