NASA's Ares I-X, the first launch to use significant hardware from the Ares I booster intended to lift the Orion Crew Exploration Vehicle, slipped from its 0800 EST launch time due to high winds at the Cape, but is still expected to go today.
Some of those who think the Ares is a costly step in the wrong direction see no point in the test. The Augustine Commission report out last week didn't really clarify the road ahead for human spaceflight boosters. I'm not a fan of the Ares I myself. But my view is that we built the hardware, and you always learn a lot, good and bad, by flying new rocket technology. So let 'er rip.