When is GME going to be available to all users?
The Google Mashup Editor is currently in beta and access is limited to a small number of developers during this testing period. We hope to make it widely available in the near future, though we can't comment on the timing of its availability.
If you would like to be notified when spots are available to participate in the beta, please sign up here. You will need to have a gmail.com email address to participate in the beta.