Marketplace And Xbox Live
Marketplace
Windows Phone Marketplace is analogous to Apple's App Store and Google's Play (formerly Google Market). You can either make purchase from your desktop computer using Zune or directly from Marketplace on your smartphone. Videos are the exception since you have to buy and download them on your PC, and then sync them to your smartphone.
Xbox Live on Windows Phone 7
A dedicated tile lets you view your Xbox Live profile, including avatar, game scores, and leaderboards. You can even message your friends. Microsoft claims that the capability to play real-time multiplayer games on WP7 will be available in the near future.