This is a pretty cool jQuery/JavaScript/Galleria based image gallery, check it out it works well if I may say so.

Allows you to easily, and I do mean easily add new images to the template. Simple add images to an unordered list, and the Galleria system will automatically create the thumbnails for you. This one is not XHTML validated due to the amount of inline code that was necessary to make it work, but nonetheless it works great. (included images from WikiMedia HDR Commons)