The purpose of the SEO Results tab is for you to keep track of each part of your SEO campaign and to see how well you are progressing against your targets and your competition. Some nice features here include:
The Organic Visits and Activity graph which allows you to see your SEO activity and tasks plotted alongside key system generated events and the overall impact over time against traffic. It should give you a good indication over a few months of the benefits of some of your hard work on the SEO front.
The Month-on-Month reports are very useful in seeing how well your campaign is progressing and for comparing the ROI from your SEO campaign to PPC campaigns (if you are running any).