This is one place where Apple needs to improve. Organizations don't typically move to a new OS as soon as it drops. We would likely be on Leopard until sometime next year. But, when we buy some new hardware that is significantly different, we will have no choice but to deploy Snow Leopard on those machines. Which could be problematic, as there is software that may not be compatible with Snow Leopard that our users require.
Apple needs to offer more backward support for their new hardware. Hell, there are times that even our standard image with the latest point release, that image still won't work on a new machine. So we have to have a separate image for that one machine. This is where Apple fails in enterprise environments.