Here's the best article I've come across about Bush's speech last night and our current dilemma in Iraq. It's by William Saletan, and he likens the U.S. position of open-ended support of Iraq to domestic welfare programs that promise ongoing support to those who won't help themselves.
By the way, there's a very good reason why, as Saletan notes, members of the new Iraqi government are not "standing up." It's because when they do, they tend to get assassinated.