The Sept./Oct. print edition of Mother Jones' includes an impressive, dismaying timeline of the Iraq war, "Lie by Lie: How Our Leaders Used Fear and Falsehood to Dupe Us Into a Mideast Quagmire."
It's not online yet, but Mojo has posted the following note:
Coming soon: an interactive, searchable version with more than 800 entries and 2,000 links to original source documents. …
Cool. Keept an eye on that space — this timeline deserves a good bit of attention and this promises to be the kind of resource you'll want to bookmark for future reference.