The PSN has been up for a little while now for multiplayer in North America, but today is the first day that you can actually go into the online storefront and buy something. Maybe.
There are a ton and a half of errors on the network which can be more than likely put under the heading of 'first day unforeseens' and high traffic. It seems that a ton and a half of PS3 & PSP users were just dying to get back online. Imagine that.