Still down for me, as of 9:07am PDT; which is about half an hour after SD reported it down for him...
So yes, I agree with his opinion that it just doesn't work for guests...
Try logging out and see if you get the same error when trying to browse. You can turn on error reporting to the browser by editing libs/mysql.inc.php and changing:
To:
And it'll spew the error out to anyone trying to load the page; then we can determine the issue (be sure to set it back once fixed).
Another option is to turn on error logging in the control panel; but then
we wouldn't be able to see the error.