Zenwalk 6 is the latest release of Zenwalk Linux. The changes are major enough that most people will find it worth making the upgrade (note Xfce 4.6). Zenwalk has come a long way with Zenwalk 6, from its beginnings with creator Jean-Philippe Guillemin, also known as Hyperion.
Zenwalk is a fast distribution and has low system requirements so you can use it on older, slower computers with no problem. Zenwalk 6 is no exception to this rule. The new Zenwalk 6 looks a lot like 5.2 so it will feel familiar.