I had a long post written up about the execution of Saddam Hussein. I decided at the last minute to not click the "Submit" button. But, my friend Niran wrote up an eloquent post that says it much more clearly.
One thing I'd add is this: I'm truly curious about the proportion of the American population that think Saddam was executed as part of the War on Terror™, or to grant democracy in Iraq. His execution had nothing to do with either (no WMDs have ever been found, and execution by a foreign power - even through a fledgling local puppet government - is no way to instill democracy).