If you use Google Analytics, you can create an account at www.yottaa.com and we'll chart visitor count, bounce rate, and a few other metrics against your websites performance. If your site is new to us, it will take a few days before there's enough data to be interesting.
We have a lot of very cool features planned to extend this as well.
We're also working on putting together some aggregated statistics about these metrics for a future blog post.