Version 2.57b was released a couple of weeks ago. This version has over 100 significant bug fixes. You can get your copy at: Blender 2.57b Download

Windows Installing?
One of the problems I’ve had with Blender is my need to run multiple versions. Until just recently building for Myst-Uru Plazma required 2.49b. Also, the Collada exporter in 2.49b is reputed to be better for Second Life. Then there are the JASS and Primstar tools made by Gaia Clary and Domino Marama which have dependencies on Blender and Python versions.