You could also download an app remotely from your PC to your phone, called Android Lost, and track it that way, go to the site Androidlost, and sign in and it will install the app on your phone, and you can track it by GPS you can also do many other feature, like Lock it, delete all the data, jam the Sim card if you have one, make a siren go off, sent a text that will talk etc... works great, my buddy lost his phone last week and I was able to install this app on his phone remotely and we found his phone. but you do need to have a Gmail account set up to the phone. Follow the instructions if you do not have the app on your phone, it will tell you how to install it remotely, and yes there is Plan B also that is another option.
Android Lost
http://www.youtube.com/watch?feature=player_embedded&v=gcTZbreowJM