Looks like a developmental version of ext4 is included in today's release of the newest kernel: 2.6.19
I'm pretty excited about ext4...hopefully they'll focus more on stability once it goes into the kernel.
im still using ext2 on my slow laptop hard drive. went for that over ext3 to loose the journalling overheads and hopefully gain some speed.
i was tempted to try something more exotic (reiser,xfs) although its reassuring to use a mature and well supported fs with plenty of tools available. hopefully ext4 will mature to the same standards.
i may be paranoid but after an incident a few years back, data loss really scares me
I haven't had the time to try out ex4 yet, but if Fedora Core 7 is going to adopt EXT4 for the default format that must mean something about the rate at which it is progressing.