v2.5.0 works with Mountain Lion 10.8, Lion 10.7, Snow Leopard 10.6 and Leopard 10.5
The beta release can be obtained by checking the 'include beta' versions checkbox of the update panel.
Mountain Lion 10.8 CompatibleZooom/2 works with Mountain Lion. You can install 2.5.0 on any Mac and it'll "just work".
Lion 10.7 CompatibleWith version 2.5.0 - Zooom/2 becomes Lion compatible. You can install 2.5.0 on any Mac and when the time comes to upgrade to Lion 10.7, Zooom/2 will simply "just work".
2nd July 2011