lynda.com has some pretty good online lessons but I would recommend just going out and buying their DVDs.. I think they go for $150 per session but in my opinion worth it if you are new or intermediate, I have reviewed both the Flash CS3 Professional Essential Training and the ActionScript 3.0 in Flash CS3 Professional Essential Training. The benefit of the DVDs is that you can go back and watch over and over vs. online which is a monthly fee.
As for books, lynda might have some of the best self taught lesson style books but they hold little re-read value.
Also check out the Peach Pit Visual Quick Start Guides, highly recommended as they server well as 1. lesson based, not tutorial style like lynda, and 2. reference for later use.
Sadly, a lot of the CS3 books don't come out till September. Check out peachpit.com and lynda.com for info..
peach pit actually controls the publication of the lynda.com, adobe press and apple training books.
My advice is to get the DVDs or Books from lynda and then pick up a Visual QuickStart guide for reference.
Moock Coolins is also a good publisher to use for learning and referencing actionScript.