Yes, please DVD's. I can't get to MozCon, but would be in line to purchase DVD's with as much material you can pack on it!

Probably nothing to worry about (Google will index content in hidden divs). The first post was just a rule of thumb.

Can any other mozzer's chime in?

A good rule of thumb is if you can see all the "hidden" content if Javascript is turned off you are basically safe.

Anytime. I'm glad you asked it because I don't think many people realize how high these numbers may be (I know I didn't have a clue).

See below from Azigo:

This post is a place to keep track of the sources of this info. So far I’ve only found a few numbers. Must keep digging.

• 30% of users delete cookies according comments by Jules Polenetsky on a panel at the W3C Workshop on Web Tracking and Privacy
• **40% **of users delete or block according to OpenTracker.net
• 36+% of Australian Internet users delete their third-party cookies in a month according to comScore report (2011)
• 76% of Safari users block third party cookies according to Gibson Research. Note: This is super-high because Safari is the only browser that blocks third-party cookies by default

I don't believe you can find out if someone is using Webmaster tools or not. However, you can easily check to see if they have a sitemap by  filetype:xlm sitemap site:domain.com (you may have to play around with this). Also, this doesn't mean it has been submitted as well.

Typically table layouts takes up more code than div layouts (and thus increase load times). Faster websites typically rank higher (with all things being equal),

See Matt Cutts video on the subjected (though--pretty old).