It was down for more than an hours and all my Gmail accounts including the Google App one were all inaccessible during the time. It wasn't a big deal for me but I am deadly sure it matters for a lot of others. I can't just believe it happened on Gmail, a solid-stable system that never failed on me.
Just don't know if we should ever trust the cloud computing. Is moving all data online especially your business critical data still a really good approach?