Blender is powerful 3D modelling tool. What makes it really powerful is support for Python.
I was playing little bit with configuration of Intellij IDEA and I found out that it is possible to use Intellij IDEA for developing Python scripts for Blender.
Here is video tutorial:
Update 23.06.2011: Video tutorial was recorded for Blender 2.57. There is small change in Blende 2.58 – scripts are located in Program Files directory, like: C:\Program Files\Blender Foundation\Blender\2.58\scripts\modules
Some useful links: