Some sites I've found useful but which are not specifically geared toward scrapbooking are
www.totaltraining.com ,
www.lynda.com , and
www.creativecow.com
Some of these have free tutorials and podcasts, some are a paid monthly or yearly subscription, and some have DVD's. The nice thing is that if you have the whole CS3 suite, you can learn any other Adobe programs you are interested in from those sites too. I have found them all useful for different things at different times.