I use jalbum, http://jalbum.net/ to make image galleries for my website. Very simple to use. Makes thubnails and generates html in a number of built in styles, and there are more to download. You can also tweak existing, or create your own, if you know a bit of html.
You don't like the design of the program, or the galleries? There's limitless possiblities for galleries, and many of them, (most of them) are clean and simple.