I'm seeing quite a few comments across the web from people saying they were in the 1.5%, which makes me wonder how accurate that number is. Then again, Gmail has a LOT of users, so that could be a very accurate number.

We use Google Apps for Business and were experiencing delays of several hours, and I did receive some bounces when sending to others within my organization. Strangely, most of this happened when using Outlook with Google Apps Sync - not when using the web interface.

Still, we've been very happy with the service - things like this happen every once in a while. We made do until it was straightened out.