BlackOps has posted in the Gearbox HaloCE forum about a modification that he and some associates have made to an Unreal Tournament 2003 statistics program. Now this statistics package works with Halo server logs if you have FTP access to the logs themselves. They aim to produce an open source Halo statistics package; currently it tracks kills, deaths, suicides, team kills, who killed whom, flag scores, double kills, triple kills, killtaculars, and more. It also implements a UT-style ranking system, where players with low ranks get more "points" for killing players with higher ranks. You can see a demo of the system as well.
Thanks Louis Wu at HBO for the heads-up. This may be a precursor to what we'll see in the XBL portion of Halo 2.