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Posterous has introduced a sweet new feature -- photo slideshows -- for sites, posts and groups; this feature really brings photos to life.
Posterous site visitors and group members can now click on the slideshow button atop a site or within individual posts to view images in a stylish slideshow.
The fullscreen lightbox UI elegantly and automatically cycles through all photos posted to a site or shared within a single post. You can pause the slideshow, fast forward or rewind and toggle between a whole site and an individual post.
The addition of slideshows is a simple update, but one that dramatically impacts how users will experience photos shared via Posterous.