After nearly a week of beta testing, Virtuous 3.1.0 has been released. Either grab it in our download section or ROM Manager. This was the first time since 2.0 that the ROM was entirely re-based on a new Sense build (10/13 build, detailed in the "other releases" section), which includes a new kernel. Most of the other changes are maintenance oriented in nature, updating apps to the latest releases and integrating fixes (Flash, audio, etc) which were released as patches to 3.0.1.
Although I have stated this many times, no wipe is required. However, if you encounter issues, you should wipe before reporting your issue as a bug. I have been seeing improved responsiveness and battery life with this release but everyone's millage will vary based on your usage.