Illuminate labs yesterday announced that its flagship product Turtle 4.1, has entered public beta stage.
Turtle 4.1 includes a completely new GI user interface, which enables you to select the primary and secondary GI solver of your choice and then tune them individually.

Turtle 4.1 also introduces a Radiance Cache, speeding up Radiosity Normal Map calculations, giving both faster and better results. In addition, we’ve now included Path Tracing in the global illumination toolbox, making it easier to setup multi bounce global illumination renders, and improved the Image Based Lighting and HDR user interface by unifying the environment control settings.

Turtle 4.1 supports Maya 8, 8.5 and the new Maya 2008.