Part of the work I've been doing with JD Lasica for his Social Brite project (yes, there is an irony in the fact that a careless, sarcastic SoB teamed up with a caring, polite and nice guy such as JD) included creating a Creative Commons plugin. I'm quite proud to say that I've released the plugin for the public in version 0.1 0.1.1.

It is based on the amazing Job by Nathan R. Yergler and his WP-Licencse Plugin.
What WP-license Reloaded does is allowing per-post licensing. This is particularly helpful for multiple author blogs and sites.
This plugin is on its early stages. For the future I have planned:
- Defaulting licenses (on a per blog and per author basis)
- Bulk Updating licienses (for older posts)
- I18n of the plugin.
- Anything else you might suggest and that I find cool enough to implement.
I've always thought that copyright (the traditional one) is a big halt to human and knowledge progress. Now I can lie to myself and think I made some progress by unleashing this plugin to the public.
Feel free to add suggestions in the comments.