If you know some flash, this is really nice
SlideShowPro / Examples / Keep it simple
You'll see in the link that there are several different types of gallery that you can create - the one above is the simplest and might be what you're looking for.
It's based on a flash component and is fairly hand to put together. I'm using it on a couple of projects at the moment (nothing complete yet to show you, sorry) but so far I think it's great.
It costs 29 dollars.