Use tools like INSIGHTS for Search, Compete (Search Analytics reports), HitWise, SEOmoz Tools ETC to understand your performance in context of your competitors.

Without knowing what you want to show it is hard to make a recommendation as to how to visualize. There is no upper limit to EFFECTIVE ways to visualize data.

But if it helps I love Tag Clouds, Keyword Trees, and Motion Charts. Also while it not so MUCH a visualization, I love how effectively you can GO from thousands of rows to just the few that matter using Weighted Sorts.

Use tools like Insights for Search, Compete (Search Analytics reports), HitWise, SEOmoz Tools etc to understand your performance in context of your competitors.

Without knowing what you want to show it is hard to make a recommendation as to how to visualize. There is no upper limit to effective ways to visualize data.

But if it helps I love Tag Clouds, Keyword Trees, and Motion Charts. Also while it not so much a visualization, I love how effectively you can go from thousands of rows to just the few that matter using Weighted Sorts.