Version 3.10.2 was released on July 23rd.
There were several bug fixes as well as repairing some upgrade issues from version 3.8 to 3.10.
I had done two 3.8 to 3.10.1 upgrades but had been holding off others due to reported problems (not that I experienced any). Now that 3.10.2 is out it's time to get systems upgraded. I believe most of the problems had centered around HA systems.
3.10.x provides some great call routing capabilities that we had to rely on gateways for in the past. This simplifies installs and allows the end-user an easier way of tweaking their routes.
I have done an upgrade from 3.10.1 to 3.10.2 on my test system and also done a fresh install of 3.10.2 from ISO (http://sipxecs.sipfoundry.org/pub/sipXecs/ISO/sipfoundry-3.10.2-centos5-i386.iso) without problems.