Given the searing weather in the Gulf during the summer months, I think it was better to stage troops during the winter months. Bush is cutting it a bit close to late April for my liking, but I don't think it takes an ulterior motive or conspiracy to explain the current timeframes.
I have a bet with him, as do some others. Amazingly, although if we don't invade or see Saddam exiled or assassinated by April 1, at which point I lose my bet, I somehow am quite calm, unlike many of the handwringers and armchair generals here.
I believe The Great Satan has read more into events than are warranted. Scooter Libby's belief on the source of the anthrax is not the most expert in the administration, and I didn't really see them covered in the book. Woodward has a habit of picking and choosing phrases, which are not deniable but are inserted in text to push his theories along. I don't know that Woodward has been back to the White House since his book was published, so I have no way of knowing what that situation is. However, I think Cheney's comment was true. At the time (right after September 11), we weren't ready to attack a state sponsor of anthrax. Right now I believe we are.