We don't provide a page with a list of your keys, however you can
simply create a new one any time you want. If you go to the Earth API
homepage you will see a link to
http://code.google.com/apis/maps/signup.htmlwhere you can create one. If you don't wish to keep coming back to
this page, you may wish to create yourself a local document with a
list of your keys and their associated domains.
Cheers,
-Josh