This question about image galleries and slideshows reminded me of a great tool I discovered recently after doing research for a client who needed a quick solution for enabling Flash slideshows. It's called FSViewer:

http://www.lackadaisical.com/apps/fsviewr/

All that's required is dumping a batch of images on Flickr, putting them in an album, and then opening the XML file provided by FSViewer and plugging in some easy variables. The result looks like this. Have you guys used any good tools lately that make use of the Flickr API? There seem to be a lot of little widgets that let you import photos in interesting ways.

Looks good. Though, I'm searching for a solution that could play a slide-show of all the images. (doesn't matter if flickr or not) I can't seem to find one. :/