I'm trying to decide whether or not to upgrade from CS3 to CS4 at work. From what I've read, PS and ID aren't all that different but AI (which I use a lot) is dramatically better. What about DW though? Can anyone with a decent amount of experience with both CS3 and CS4 give me a quick compare/contrast? I use DW a lot, so if it's truly better that (and the new AI) would probably make upgrading the whole suite worth the money.