We're getting flooded with reports of iTunes and the App Store being down in numerous regions. Browsing the stores still works, but downloading or trying to update apps does not.
It doesn't seem to be affecting everyone, and some who were affected for a while seem to have recovered, but others are still having the problem.
If you can't access iTunes or the App Store, or get your apps, you're not alone. Let us know, along with where you are. If you're fine, or if the problem has been fixed for you, let us know that as well.