Mira has a very neat blog where she shares a lot of great tips on photography. Her food photography is really striking, too. Right now she has a feature about Topaz Labs. I have read about them before, but Mira does a great job of showing specifics and screen shots. I am very intrigued.
So you should go over to her site, read more about Topaz Labs and enter her giveaway to win a set from them. While you are there look around and read a little. She really has some great advice to share.