Anothing image gallery application from Airtight Interactive, PostcardViewer seems to be a kind of "lite" version of SimpleViewer. Again you have to pay if you want the noncompiled swf file and the download link removed, but its a very cool looking gallery and easy to use, with few options. Go have a looksie.

A nice little free script using PHP, XML and Flash (all source code available) to create an online image gallery with thumbnail capabilities.

An open-source alternative to the widely used Simple Viewer, this is a tutorial (with download links to the full source files) for creating a PHP/XML/Flash simple thumbnail-powered image gallery.