Theoretically, I've upgraded my installation. However, I'm never sure if I've done it correctly for a day or two - blame my Murphy genetic makeup (Murphy's law, anyone? Bueller?)
Movable Type - News - Movable Type 3.16 released:
The Movable Type team has been hard at work and we have some very exciting things coming in the 2005 release schedule. To kick things off we are proud to introduce Movable Type 3.16.
Movable Type 3.16 sports significant improvements to application security and over one hundred other fixes which really make it a highly recommended upgrade for all users.
I just finished upgrading as well. Seemed to go fine. But, I am like you, I have to wait and see.