Since we announced last week that Atelier would only be available as an Eclipse plugin, some of you have been asking about how to convert from your standalone client. Here's what you might want to do.
In your new Eclipse install, you can go to File > Import > General > Existing Projects into Workspace. Then for the directory you can pick the workspace from your standalone Atelier install. You can check/uncheck the projects to import into Eclipse. You also have the option to copy the project to your current workspace so that the physical files get copied over.
You can also bring your Atelier preferences along by exporting the preferences with File > Export > General > Preferences and then importing it into your Eclipse install.
Hope this helps. Please feel free to let us know if you have any questions.