I just finished the first release of my Creative Commons plugin. It's a fork of Firas' WP-CC plugin and extends its features.
You can select jurisdiction, license and license version. The plugin supports any available jurisdiction, any available license versions (currently 1.0, 2.0 and 2.5, depending on the selected jurisdiction) and any available CC license (apart from public domain, CC/GPL and CC/LGPL).
License selection is supported by a wizard to ensure that no invalid combination of jurisdiction/license/license-version is chosen by the user.
Similar to WP-CC the license information can be added either automatically or manually (by calling one of three template tags). Similar to WP-CC the following output "formats" are supported: metadata, linked image and linked text.
More detailed information about o42-CC can be found here. The plugin itself is distributed under a BY-SA-2.0-de license.
Comments and suggestions are highly welcome.