Photoshop Elements is such a powerful piece of software.  While I have learned a ton about it's capabilities over the last 6 years by playing around with it, I am still finding out new things each week.  One of the places I turn to for tips and help is Photoshop Elements Techniques.  While Digital Scrapbooking Classes is the best place to learn about scrapbooking with PSE (I know I'm a bit bias), Photoshop Elements Techniques is one of the best places I've found for tips on editing your pictures in PSE.  In simplest form it is a magazine you can subscribe to, but once you are a subscriber you also get access to all sorts of things on their website including pdf downloads of all previous issues.  You should check them out!