Planet CreativeCommons is based on Venus. Unsurprisingly, given their mission, they visibly highlight the license under which each of the entries are published. The Universal Feed Parser and Venus take great care to ensure that license and rights information is present in the Atom feeds that are produced, but this is the first time that I’m aware of this data being exposed in the HTML page itself.
I’ve committed subtle change to the template that Planet Intertwingly uses (themes/asf) so that the rights and license information present will now be obtained from theh HTML page.. At the bottom of every post is the author information. When rights or license information is present, the simple word “by” will be replaced by the © character, and it will be associated with a hypertext link to the license and/or a mouseover text with the rights information.
James Snell’s posts are annotated with both rights and license information. Tim Bray’s rights declaration would fill a small book, and Firefox will summarily truncate it on display.
The Creative Commons Wiki has information on how to add this information to RSS 1.0, RSS 2.0, and Atom 1.0 feeds.