Harry has posted a spoiler of humungous proportions, laying out the entire story of the game in summary form.

If you don't want to know, don't click the link.

HBO's own Louis Wu posted a note that IGN has put up a complete-- and I do mean COMPLETE-- walkthrough of Halo. As Louis notes, you can get around having to register with IGN to see it if you turn off javascript in your browser. Here's what they say in the introduction:

With the Xbox's launch and Halo's release now upon us, we know there'll be some sharp divisions on the site, especially between those who will be playing Halo on an Xbox these coming weeks, those who won't be able to get their hands on one for awhile, and those who are waiting for the PC and Macintosh versions.

Marty O'Donnell is telling everybody over at the halo.bungie.org forum they should think carefully before deciding to watch the Gamespot movies recently made available. While it may be too late for a lot of us, he's still got a good point:

Okay, true believers... before you click the link to read GameSpot UK's preview of a nearly complete copy of Halo, decide how much you really want to know before you play the game for yourself. While the revelations aren't completely new or startling, some people probably don't want to know any more about the backstory than they already do... so if you're in that part of the pack, you've been forewarned.