I've just installed Leopard on my MacBook Pro, and was first disapointed that it only had read only zfs, but after checking out ADC that was solved :)
I also wanted to try out Time Machine and thought that I could place the backups on zfs, but Time Machine doesn't let me select zfs as a destination. Hopefully I'll be able to trick it somehow ;)
Update:
after Jeff Harrell's comment I read up on Time Machine
here
and here,
and as Jess says it uses directory hard-links, so that won't work with zfs. Bummer! :(
