Hmm... not entirely sure what you're looking for, but here are some ideas:
There's a free version of
Flash Gallery available at their website. I'm not entirely sure if it works as a standalone, but you can just go there, download and find out.
They also have commercial versions with more options and support for sale, for 15 and 29 (Euros? Uhm. Anyways...)
Then there's
SlideShowPro. Looks a bit more professional, very clean, and fully customizable. Not entirely free, though... a single-user license is $29 (more about this option
here)
If you've done away with your Flash, there's a standalone, customizable SWF for web developers without Flash included. Also looks like the documentation is rather solid.
Depending on what kind of options you have on your web server, you could also their
director thingie, which would allow you to easily upload and manage your photos.
Another option would be
imagevue. It's also quite a bit more expensive ($150 for a commercial license).
It's also fully Flash, and you can use it either as a
gallery or a
slideshow.
It comes with a nifty
administration tool, too. However, there are also some server requirements.
There are more options of you don't care about whether it's Flash or not... one free option is
ImageIsle. There's also a commercial version of it, called
ImageIsland, with more options ($29).
And then there lots more
here, all apparently free. Some good stuff there...