Dopplr
Dopplr is a web site that makes it easy for you to record and share your travel plans. There are many ways to record your itineraries. You can go to the web site to fill out the forms. You can forward your airline itinerary via email and Dopplr will automatically parse the email for information. You can also add using SMS or their iPhone app (The Social Atlas). The web site has tools to view the places that you've traveled to, as well as other's.