For some reason I always freaken forget this. I'm using an ancient version of Photoshop (7), though I'm eyeing CS 3 and I will probably break down and purchase it this year. I do a lot of simple image manipulation, but I always seem to forget how to make rounded corners. So for reference, hit the U key, set the feathering to about about 15 pix, and then draw your rounded rectangle. Then go back to the square select bool, set the feathering back to zero, and grab and crop your rounded corners. Simple, but I always forget, so here it is for reference.