Release Notes: Security fixes, bug fixes, Java client enhancements and performance improvements were added.
Release Notes: The usual assortment of bug fixes and performance enhancements as well as some new features to make administration and management easier. Massively enhanced Java client with faster download as well.
Release Notes: read changelog (Note: 1.6.6 is available for Microsoft Windows)
Release Notes: This is a development release. Support for Linux kernels 2.1.x and 2.2, many optimizations.
Release Notes: Many updates and fixes since last announcement. On a side note, 1.6.4 is available for Windows 95/98/NT.