Silvery - 4:34 pm on Jul 30, 2010 (gmt 0)
I really don't know why you haven't expanded your strategy to also focus upon rankings in Shopping and Youtube, as well as perhaps some other verticals which could potentially begin inserting themselves into the SERP, such as blogs, news, images, etc.
Ever since Google introduced Universal Search, your opportunities really have increased, rather than being whittled away. You just cannot continue with a single-minded focus on the primary organic rankings any longer -- you need to think about ranking under multiple vertical searches as well. The cumulative effect can also help out with the main organic rankings, too.