Xbox 360 Edit
The Xbox 360 is the successor to the Xbox.
Games for Windows - Live Edit
Windows Mobile Edit
The Zune website uses Xbox Live.
Zune HD Edit
Zune HD uses Xbox Live.
XNA is a service of Xbox Live.
Silver membership is free but doesn't have multiplayer, Facebook, or access to many other features.
Gold membership costs $50 a year and lets you play online and access a few other features.
An XNA membership costs $100 a year and is separate from Gold and Silver memberships. An XNA membership allows you to create homebrew Xbox 360 games.
See also Edit