Media RSS and PicLens browser extension
Media RSS is a RSS module for media. Currently, RSS2 has the enclosure tag to handle media, but it’s limited to only one slice of media per item. And not only that, there are only two pieces of metadata: MIME type and file size. Without getting into the details, MRSS simply puts more focus on the media and the metadata around media. It also allows more than one media item, per item, and can handle any/all types of media at once. For instance, if I traveled a lot, I could have a vacation feed that would show a photo gallery and several videos per vacation, rather than one image or one video. If you really care, read Yahoo!’s Media RSS FAQ (they pretty much invented it). Post preparation is now over. Sorry for that.
PicLens is a browser plugin that will provide a full-screen slide show for images on sites that support Media RSS. Anymore, slide shows are being designed in a way that actually makes them pleasant to use. Obviously, Flickr supports Media RSS, but I still choose their slide show over PicLens when browsing sets1. However, I find PicLens especially useful for browsing image searches outside of Flickr.
1 For testing purposes (if you do install the plugin), here’s a portfolio set by my favorite photographer.