http://xboxlive.ign.com/articles/116/1163826p1.htmlWhy, yes, it is.
April 25, 2011
Although the PlayStation Network went down on Wednesday, April 20, 2011, Xbox Live is still up and kicking. So while PS3 owners are unable to play online, download games and do anything else related to the PSN or PlayStation Store, you're fine if you own both consoles or just a 360.
Here's a list of things you can still do:
•Download recently released Xbox Live Arcade games like The Fancy Pants Adventures
•Use Netflix
•Fire up party chat and catch up with your friends
•Try out the Gears of War 3 beta
•Play Mortal Kombat and Portal 2 with friends
•Compare Achievements or leaderboard positions
•Sleep soundly knowing that your credit card information is safe (for the moment anyway)
•Know that if Xbox Live ever goes down, there's a good chance you'll get a free Xbox Live Arcade game