2008-07-15: Delayed allocation has been merged into Linus's ext4 git tree! We have started maintaining patches against the latest 2.6 mainline kernel for make it easier for people to try out ext4.
2008-07-14: The Ext4 Howto page has been updated so it is fully up to date with how to get started using ext4.
2008-07-10: E2fsprogs version 1.41.0 was released, with full ext4 support
2008-04-13: Fedora Core 9 has been released with ext4 preview support.