I am extremely glad to see 2.6.25-rc1, specially due to some of the new features that I've added.
A list of features is mentioned in the LWN article about the merge window for 2.6.25-rc1. This includes the memory controller (now called memory resource controller). Check out http://lwn.net/Articles/268937/ as well. We also got fake NUMA nodes for PowerPC and many other small fixes.
I have a new favorite website for git changelogs http://tree.celinuxforum.org/gitstat/index.php
Check out some of the cool graphs from that website