lizardx - 12:22 am on Jan 9, 2005 (gmt 0)

<< You’ll continue to see us doing this on occasion for the forseeable future. As before, the service remains in beta status and we will officially launch it when it’s ready. >>

From their blog. I'd say the key word here is 'when it's ready'. It's not ready now, but there is no way to test the system without exposing to real traffic, so it makes sense for them to do that intermittently, they can't just go live one day and hope it all works under full load.