This event is only notable because it doens’t happen that often, but yet it happens all the time, just not to Google. Corporate email servers have problems all the time… academic email servers even more often (some have planned weekly outages of 4 hours or more). As I pointed out a week ago in a blog post, not every email system is up all the time, especially not academically.
GMail is expected to be up all the time, and there is nothing wrong with that expectation, but I think up to this point, they have done a damn good job with system stability and availability.
I personally am a Google Apps user and I didn’t even notice the problem. Usually I’m among the first to notice things and tend to be the first to bitch.