Help choosing learning material for compositing.

hello guys,i want to learn node based compositing which most of comp. softwares are using…like blender.I am little bit familiar with layer based compositing in after effects but truly very “little”.So please guide me if you have gone through some nice learning material,tutos which can guide me.Thanks :o

http://www.blender3d.org/e-shop/product_info_n.php?products_id=161


http://www.blenderguru.com/

http://cmivfx.com/store/255-Blender+3D+Compositing

Hey Richard I hope you save this page as a reference for next week when someone asks the exact same question. Again.