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The W3C XHTML/HTML Markup validator
The W3C CSS validator
The first thing to note here is that Bobby is an automated translator and will suggest things that may not necessarily need fixing. For instance it cannot always detect wether you have provided alternatives, (such as a [D] link) and will mention the need to fix things that have already been done.
The second thing to note is that as Bobby is automated, it won't pick up errors in your code. So perhaps you have added a picture an left the ALT tag blank (alt=""). Bobby can't tell what the picture is, only that it does contain an ALT tag and it will deem this correct. Human testing is always superior.
You can also turn on XHTML by going to Validator in the same window and selecting XHTML 1.0 Transitional. When creating a new document, you can tick make XHTML compliant in the bottom right corner of the window.
In Dreamweaver MX, you can also test your website for accessibility.
1. Open the document you want to check.
2. Choose File > Check Page > Check Accessibility.
You can also check an entire site. For further information, open the Help Menu in Dreamweaver MX and search for validating your tags.
More about Dreamweaver's accessibility.