The best by far is Lynda.com
This is a subscription service that costs a whopping $25/mo but you can learn an awful lot in a month. I have been using it for 2 months and my plan is absorb as much as I can in 4 months, then use a good book or the manual for reference.
Check it out, there are lots of free examples. The tutorial disk that came with your CS3 also has some tutorials from lynda.com.
Mike