Official Google answers to common SEO questions

Question:

How effective is Google now at handling content supplied via Ajax?

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Question	Views
How reliable is the 'site:domain.com' query in determining the number of pages in the Google index?	1,088
Can I use robots.txt to optimize Googlebot's crawl?	957
Does PageRank take into account cross-browser compatibility?	1,030
A site for my client's competitor shows up on a SERP for keywords that never show up in the site anywhere (not even hidden in the source code). How is this even possible, and isn't this spam?	1,200
An orphanage website I work on is showing up for searches on "girls in bathrooms" because they have an article about renovating the girls' bathroom! What do you think of the idea of a negative keyword meta tag to block irrelevant searches?	1,134