Blender 2.40 is out and an IRIX 6.5 MIPS3 binary (many thanks go out to ChiaHos) is now available in the "unsupported" download section.
This is a rather large update with lots of improvements in character animation, particle and physics simulation and much more. A complete list of the new features, along with examples and descriptions can be found in the Blender 2.40 release log.
