Are you receiving a 80710a06 error code? Don't worry, it's not just you. There's some unexpected and unplanned maintenance going down on the network. Keep up with what's going on at the playstation blog.
http://blog.us.playstation.com/2011/04/20/update-on-psn-service-outages-2/
And just when I was going to start portal 2 co-op :C
http://blog.us.playstation.com/2011/04/20/update-on-psn-service-outages-2/
And just when I was going to start portal 2 co-op :C