Nope. I couldn't get into the Marketplace either for at least ~4 hours before I went to bed. Seen more than a few other people asking about it. I think something went wrong big-time. First extended marketplace - on any platform - downage I've experienced, and due to the Zune Pass services, the most impacting on any platform.
And predictably maybe, zip about it on the WP Blog.
I'm probably being over-judgmental but Mickey Mouse does seem to sum it up from where I'm standing.