Matt Cutts: Is it necessary for every page to have a meta description?
Topic: Is it necessary for every page to have a meta description? – Quick Answer: No – Keep them unique and apply them to the most important pages.
Matt Cutts: How can I make sure Google reaches my deeper pages?
Topic: How can I make sure Google reaches my deeper pages? – Quick Answer: Link to them from the root page
Matt Cutts: What’s your take on “addon domains”?
Topic: What’s your take on “addon domains”? – Quick Answer: 301 to main site if you have them. Don’t make multiple sites
Matt Cutts: Should I use the nofollow attribute on internal links?
Topic: Should I use the nofollow attribute on internal links? – Quick Answer: No
Matt Cutts: Which types of Webmaster Tools errors should I report to Google?
Topic: Which types of Webmaster Tools errors should I report to Google? – Quick Answer: None
Matt Cutts: Is posting blog updates to Twitter considered a doorway?
Topic: Is posting blog updates to Twitter considered a doorway? – Quick Answer: No