buckworks - 3:31 pm on Sep 17, 2009 (gmt 0)

One of the comments on that video said this:

"real world tests show the things that go into clean, valid and accessible code DO help websites do better in SEO."

I am convinced of that too. Validation might not be assessed directly but a developer who strives to write valid code will likely do other things better than average which do make a difference to one's SEO results. It's all part of the mindset.

For me personally, some of the most important thoughts I ever read about the mind that is committed to valid code are Claus's comments in this thread:

[webmasterworld.com...]

That said, "perfect" validation is not always realistic, but "better" validation usually is.