From MediaPost
+One sided strategy: Do optimize for top tier engines and natural AND PPC
+Failing to determine conversion values: Do determine values in step #1
+Bidding on PPC randomly: Do (again) determine conversion values
+Building a search engine UNFRIENDLY site: Do determine if design elements such as: Frames, Javascript, and text contained in graphics are necessary; as these elements make it hard for the crawlers.
+Failing to consider seo in the redesign process: Do engage your SEM firm right from the start
+Cookie settings too short: Do set your cookies to accommodate “searchers” that may visit 2-3 times before buying.