The Halo 2 Autoupdate is a small piece of software which will improve the functionality of Halo 2, most notably in the following areas:
Matchmaking: Some players have experienced irritating delays while waiting for a game to be found while in Quickmatch and Optimatch. This is caused by a combination of factors, including connection speed and other detailed nuances of matchmaking. We have isolated the cause and applied a solution to the autoupdate which should normalize that wait time.
480p Support: The autoupdate will improve support for 480p resolutions on a wide range of HDTV and EDTV displays, correcting a flaw that the software encountered with some sets causing part of the HUD to be obscured. This problem does not currently occur on all HDTV sets, so it is possible that your specific set is unaffected right now and it will therefore not be altered or changed by this autoupdate. If you are seeing the HUD clip or bleed off the screen in 480p widescreen and 4:3 modes) this should address that problem perfectly.
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News source: Bungie.net
Matchmaking: Some players have experienced irritating delays while waiting for a game to be found while in Quickmatch and Optimatch. This is caused by a combination of factors, including connection speed and other detailed nuances of matchmaking. We have isolated the cause and applied a solution to the autoupdate which should normalize that wait time.
480p Support: The autoupdate will improve support for 480p resolutions on a wide range of HDTV and EDTV displays, correcting a flaw that the software encountered with some sets causing part of the HUD to be obscured. This problem does not currently occur on all HDTV sets, so it is possible that your specific set is unaffected right now and it will therefore not be altered or changed by this autoupdate. If you are seeing the HUD clip or bleed off the screen in 480p widescreen and 4:3 modes) this should address that problem perfectly.
Foundation: As something of a treat for players, we’ve decided to make the unlockable multiplayer map, Foundation, available to everyone. Previously, to unlock Foundation, it was necessary to both complete the game and activate a “training event” on the final level. We reckon that was too tough for most, and wanted very much to share Foundation – inspired by our old shoot ‘em up Marathon – with Halo 2 players everywhere. Once you have the autoupdate, you’ll be able to play this rarely seen arena map with anyone you wish. And be sure to try a game of four-team CTF on this map. It's a hoot!

Although I realise these aren't exactly "security" updates and that therefore renders my point meaningless.
Still, one of the best games of the year! bang up to date! an update in week one!!
cool
RJ
! Update ! We've decided to not include HFS in our next update to speed up development and delay everything cool you were waiting for for about a year.
! Updated Update ! SP2 no longer exists. Sorry.
I mean I noticed the sarcasm but...
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