The good news is that most of the training providers have started discounting their CS3 training products. They've already created the stuff for CS4 and have to move the old product out to make room for the new stuff. So, if you aren't planning on upgrading right away, now is the time to buy your training materials. KelbyTraining, Software Cinema, and many others have offered some pretty steep discounts to get their product out the door.
And ... speaking of discounts ... there's just a few more days left to get a discounted version of the book. Use coupon code friendofblurb08 when ordering. Isn't capitalism great!