Today I finally specified a license for my blog contents. Basically I've 2 types of licenses:
For a better explanation of my blog licensing terms, please refer to the CodeClimber Copyright and Licensing Policy.
I also changed the copyright notice in the footer of each page:
Copyright © 2006-2007 Simone Chiaretta
This work is mainly licensed under a Creative Commons Attribution 3.0 License.
To understand what "mainly" means read the full license and copyright description.
I want to thank Phil Haack and Jeff Atwood for their posts about licenses (and also here) and copyright for opensource projects and blog contents.