Its down for me too, iPad and iPhone. I cant even connect or sign in. Glad it's just not me. Did you update the iOS version today? I did and wondered if something went haywire.
I upgraded and I'm having that exact problem. I'm hoping that the store just happens to be down right now coincidentally, and not related to the firmware update.
I was updating my kindle ap and it is stuck and I can't use it. so be careful updating till things are working.
just got the apps downloaded so things may be working now after about a hour of downtime.