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MooTools' DomReady is a great example: http://mootools.net/docs/core/Utilities/DomReady

http://dev.jquery.com/browser/trunk/jquery/src/event.js#L802

put the script at the bottom of the page

I never understood why onload and all the frameworks implementing domloaded exist, script tags generally should go at the end anyway, and there is no problems with dom availability.

This is fine, if you're OK with missing bounces. If the page takes a long time to load, or hangs, then it's likely the user will close the window before the script runs.

I don't think he was necessarily suggesting putting GA at the bottom of the page. I read this as, "put the DOM ready detection" at the end of the page.

When you're writing a third party script you don't have control over where in the page someone will put it. Having code to detect DOM ready is useful in these cases.