If you have several social networking accounts, a Flickr profile, and who knows how many blogs that you've started (and let go by the wayside), then you'll want to check this out. Called WebMii, it's a simple search that gives you a rundown of how much of your content is accessible to the masses on the web right now.
Got some Facebook photos you didn't mark as private? Those will show up, along with social networking accounts and anything else you've signed up for that isn't labeled for your eyes only. WebMii is great for those of you who want to monitor and reduce your online presence by limiting what strangers have access to online, but if you're looking to become an Internet superstar, WebMii will also give you a PeopleRank score to show how visible you are online.