Nowadays, new Linux kernel releases are just numbered with 2.6.x, independent of the features being added. This version numbering might indicate that there's no jump in added functionality, but the last Linux kernel releases have brought us significant new features. 2.6.28 brought us ext4, but 2.6.30 promises lots of goodies. This h-online.com article pretty much sums up all new features in this recently released 2.6.30 Linux kernel.