The latest version of Zabbix can be downloaded from Softpedia
Zabbix 2.2 Beta 3, an enterprise-class open source distributed monitoring solution, released under the GPL (free of charge for both commercial and non-commercial use), is now out and ready for testing.The Zabbix monitoring solution has been separated into multiple branches and this latest issue is yet another development one, featuring several changes and enhancements.
According to the changelog, the overall system performance has been improved, support has been implemented for loadable modules, the application's inheritance logic has been changed to allow linking multiple templates with the same applications, and much more.
A complete list of changes can be found in the official changelog. Download Zabbix 2.2 Beta 3 right now from Softpedia.
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.