SCons 0.96.90 contains a lot of features, bug fixes, and some greatly-anticipated improvements in performance and memory consumption. Because there have been a number of extensive changes to internal subsystems, this testing pre-release is intended to try to catch any last crucial bugs before releasing it officially as 0.97 (to be released soon, we hope). You can download it directly from the download page at SourceForge. See the Relase Notes for a description of how you can help test this release and an overview of important (interface- or behavior-changing) changes. See the ChangeLog for a complete list of all the new and fixed stuff.