There's definitely something going on with the Sims 3 site. It's been down for maintenance and unavailable several times over the last few days. Maybe it's a combination of problems on their end plus heavy holiday traffic. It'll get sorted out soon, I'm sure.
On a somewhat related note, is there a way to access my Wish List without having to do a search for it? Seems like I should be able to get to it from my account somehow, but I don't see it. I'm finding it very annoying because when I search for it and then edit it, the removed items come right back the next time I log in.