also take a look at http://FreeFlashTutorials.com
I am also learning advanced Flash techniques, and while I am beyond most of the basic lessons taught here, I still find myself going back again and again.
There is a series of 4 Quicktime movies for download, over 4 hours worth of flash tutorials for free download.
There is also more advanced tutorials for (I think) 20 bucks. WELL worth it.
but start with the free ones if you are going from step zero. Use them in conjunction with the site Twey listed above and with the movies, you can follow along with the W3 tutorial to help better understand.
There are a ton more online, but as for absolute basics these are the best. Barnes and Noble or another large book store will have GREAT lessons and tutorials in book form, I'll dig up my notes and post back with some names.