gOS (either google OS, Green OS or Good OS, depending on what you read) takes a different approach from most general-purpose Linux distributions. It uses the Enlightenment desktop environment instead of the usual Gnome. In addition to the usual productivity applications (OpenOffice, the Gimp, Web browser, email, and so forth) it comes with a raft of Google apps, such as Gmail, News, Calendar, Docs, and Maps.
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Google gadgets + Enlightenment desktop + Ubuntu = gOs