There is an Open Letter posted over on MySQL.com today from the founders - David Axmark & Michael "Monty" Widenius.

To our fellow developers & users of Free & Open Source Software:
This year, we are celebrating ten years of MySQL: the database, the company and the community. It's been hard (and interesting!) work for us -- but looking back, we should celebrate how far we've come. We created the best software we could for you, and you turned it into the most popular database of its kind. We want to thank you for this.

Be sure to check it out if for nothing more than some of the stats-to-date for the momentum of MySQL...really impressive stuff. And, as one of the world's favorite Open Source databases out there, I can't see it slowing down any time soon!