OBSOLETE: The site and app have been down for years.
Update: StackCenter has been completely rewritten to use Soapi.JS2. I have also made some changes to the UI.
StackCenter is a website designed to make keeping track of all your accounts easier. Simply enter your username from one of the sites and you're good to go! You can then view your personal page that lists recent comments to you, overall reputation, etc. all on one page.
As a new feature, I added a global reputation graph for the last 30 days so you can see how you're doing.
http://stackcenter.quickmediasolutions.com (Dead link!)
I can be reached at email@example.com.