Unity 3.5 free game development engine has been released and is available for download at this link : http://unity3d.com/unity/download/
You can check the new unity 3.5 version features by checking out the detailed changelog here : http://unity3d.com/unity/whats-new/unity-3.5
Here is a quote from Unity website with a short list of the most important new features in unity 3.5 :
Unity 3.5 is one of our biggest releases to-date. It’s packed full of new features and improvements that we think you are going to love.
- Shuriken Particle System
- Built-in Pathfinding
- Upgraded Occlusion Culling & new LOD
- Google Chrome Native Client deployment
- Linear Space Lighting and HDR
Click on the unity 3.5 download link and get started with game programming !