If you haven't already heard about it (and if you've been watching the news on TV, you probably haven't), read the Downing Street Memo:

Downing Street Memo

And then sign John Conyers petition to move forward a congressional investigation into why the Bush administration claimed that the war in Iraq was spurred by Saddam's WMD, when this memo clearly shows that the decision to go to war had been made regardless. The administration certainly wasn't going to let a little thing like the truth get in the way of going to war. Furthermore, the memo clearly shows that there was no plan for how to handle the aftermath of the war...which should come as no surprise to anyone considering how things have gone.

John Conyers Petition