I've heard a few references to the negative side of praise lately. Hard to believe that telling a child they did something well can have adverse effects, but it's true. It seems that the type of praise you give can either encourage or discourage a child to do well.
Praise given in the right way can be quite powerful!
I found this Super Improver's Wall quite helpful in my classroom last year. I learned about it through Whole Brain Teaching, and found it to be one of the most popular things about my classroom. (The kids as well as the teacher loved it!)
Come over to Elementary Matters to learn more about Whole Brain Teaching and the Super Improver's Wall!