Has been giving 404 errors, not loading applications, not showing stats, and telling devs their apps don't belong to them for 4 days now.

There's a thread in Googles tech support forum for the market reporting it with over 130 comments now and Google claiming to have fixed it on day 1 (which they clearly didn't)

404 error signing up for Android Developer Profile - Android Market Help

I don't know how newsworthy this is but it's mind boggling to see such poor developer support just as Amazon launches their store.