Open Source AdvFS!
Unless you've worked with Compaq/HP/Dec DigitalUnix/OSF1/Tru64 Unix you haven't had the pleasure of working with AdvFS. While Sun is getting all the media attention by having Apple adopt ZFS into their core OS release, the beauty of AdvFS is now going Open Source. In a previous life, I spent a lot of time working with Tru64 Unix on the Alpha platform. The stability and recoverability of their file system compared with UFS was amazing. One of the best features of this file system is that it didn't kill its wife.