Because I needed it and I couldn’t find it: a tool to embed a Lightbox-based photo album viewer that uses an RSS photo feed as its input. It uses SimplePie RSS library, the Lytebox Javascript photo viewer, and RSS ‘photocast’ feeds from e.g. Flickr, Picasaweb and Smugmug.
It can be found here: tools.forret.com/lightbox/

An example: using the RSS feed of my favorite Flickr photos:
Made with the Lightbox for RSS photo feeds (Flickr, Picasa, Smugmug) tool.
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The frame opened in a separate page works nice, but the embedded iframe with the lightbox is just a bad idea.
Most of the pics are bigger than the iframe, but the borders are behind the enclosing page so the only thing you can do is use the back key.
See what I mean:
http://uploads.vanhecke.info/jingproject/2008-06-06_0212_lightbox_peter.swf
Well, apparently not all browsers treat it the same. In IE it works, in FF it doesn’t.