Google and the Berlin Wall - Nov 9, 2009. 

Google Maps - 6 Common Problems and Solutions - Dec 6, 2009.

See your site as Google sees it - Fetch as Googlebot - Dec 18, 2009.

The Google Algorithm - Dec 18, 2009.

Duplicate Content and the Canonical Tag on Google - Dec 18, 2009.

Adwords Conversions: The Difference between 1 per Click and Many per Click - Jan 18, 2010