Heard about the Downing Street Memo (DSM)? The DSM is a document - supposedly verified by sources in both the US and UK - that details the discussion that happened in a meeting between high-level UK officials, discussing the plans for Iraq and if they'd be supporting the US in its invasion of Iraq. The only problem is that it took place in on July 23, 2002, well before the invasion, during the period in which Bush was still claiming to not want war with Iraq, to have no plans on invading, etc.
Anyways, the text of the DSM is online now. I won't deny that the site is biased against Bush and the US government (and the UK government, too), but if you ignore the commentary you can just go straight to the text of the memo itself and read that. It's interesting, anyways, regardless of which "side" you're on.