Yes, I know Elements 4.0 is out already. I'm still working on my 3.0 skills and can't justify spending the 80 bucks on 4.0 just yet. I'm really pleased with the changes from version 2.0 to 3.0 as it is.
I've got a few favorite sites for 3.0, If you have any more, feel free to let me know.
Photoshop Support
Photoshop Elements Techniques
I See iPod People — The Photoshop Silhouette
Photoshop Tips
Worth 1000