If I'm not mistaken; ZBrush is about 8 months old in it's current state. Mojoworld, a little over 5 months. trueSpace 5.2 -- my guess is about a year. Have no idea on Carrara or Poser. Acid Pro is 3.0 is about 2 years old. I was just making a comment that this summer the software companies seemed to have gotten together with the goal of making me broke!