I just released gentoo-sources-2.6.28-r4. Amoung other patches, it includes four patches that help prevent data loss on ext4 filesystems during a crash. So, if you use ext4 and gentoo-sources, you might want to upgrade to r4 when it hits the mirrors.
Thanks to the hardened team for identifying those patches and making it easy to include them in genpatches.
The changes for this release of genpatches can be found here .