Derived work...

Ok... this is interesting. Even Apple is now moving to include Sun Technologies in its products (Mac OS 10.5).

I realize that they have included DTrace in the latest release Leopard... Leopard Technology
More on that (with little explaination) here.

Also they are moving to ZFS. Visit these links...
Link 1
Link 2

Even Mr Jonathan Schwartz has said that Mac will switch to the ZFS filesystem from its existing HFS+