ZFS to be the default file system in Leopard?

so basically youd need 16 million 1 ter. hard drives to max this out

b-b00gie. Don't plagiarize.
At the very least, place quotes around text you copied from another source, then name your source in the same post (preferably a link to the source page).
If people haven't visited the wiki page you copied that text from, they may get the wrong impression, and quote you and your post as the authoritative source for the information.

re: PPC - given that Leopard is not x86-only [as of now], ZFS is most definitely ported to it. Filesystem code is generally quite portable as it is.

zfs CAN be installed as root system: http://www.opensolaris.org/os/community/on/flag-days/pages/2007032801/

Apple, Inc. is porting ZFS to their Mac OS X operating system, according to a post by a Sun employee on the opensolaris.org zfs-discuss mailing list, and previewed screenshots of the next version of Apple's Mac OS X. As of Mac OS X 10.5 (Developer Seed 9A321), support for ZFS has been included, but lacks the ability to act as a root partition. Also, attempts to format local drives using ZFS are unsuccessful; this is a known bug. On June 6th 2007, Sun's CEO Jonathan I. Schwartz publicly announced, days before Apple's Worldwide Developer's Conference, that Apple will be making ZFS "the" filesystem in OS 10.5 Leopard. Marc Hamilton, VP for Solaris Marketing later wrote to clarify that, in his opinion, Apple is planning to use ZFS in future versions of Mac OS X, but not necessarily as the default filesystem for Mac OS X 10.5 Leopard.

The real advantage in ZFS, since no one has pointed it out, is that it is a zero tolerance FS for data loss. Which means its like having a Raid 5 on your HD without using 5 Hard Drives. Which is why, Time Machine would become indeed a killer app.

zfs will possibly be used for time machine but is not yet ready for boot disks, sun dont even use it for boot disks, its good but not yet mature

The (theoretical, remember) upper disk size for ZFS is indeed 16 exabytes, but that's the same as the upper limit for HFS+, the filesystem you're probably using on your mac right now. Volume size isn't what makes ZFS special, so far's I know.

Also, the 'no colon in file names' (actually the prohibition is the traditional Unix ban on slashes, but the Finder displays all colons in file names as slashes and writes slashes as colons to keep things backwards compatible with Classic) isn't a limitation of HFS+, which allows any Unicode character in file names. The limitation is created by other parts of the OS, for backwards compatibility purposes, and so is unlikely to go away.

I'd be doubtful if ZFS was the default file system, especially since the Solaris/OpenSolaris has yet to produce a stable method to use ZFS as the primary boot partition.

Maybe Apple Engineers have worked their magic tough.

if i read the wikipedia article on ZFS correctly, we'll finally be able to use colons in file names. this is great news for pro musicians who need to work with SMPTE numbers. (geeky, but true.) :-)