Open Source Software is usually distributed under software specific licenses, such as GPL, LGPL, BSD, Apache License, etc. Creative Commons is more of a license for art than a license for software.
There are also various versions of the Creative Commons. You can specify that you don't want your work redistributed for a profit, or modified, for example. First determine what do you want to accomplish with your license, then chose a license.
TRADITIONAL COPYRIGHT POLICIES STILL APPLY.
In order to enforce a Creative Commons license, you need to be the copyright holder and be able to prove you own the rights over the work. Mailing stuff to yourself as a mean to prove that is lame. You'd better register the work by your local Intellectual Property office or by Safe Creative (a popular private Intellectual Property Office).
I also recommend to sign the digital copies you send to the registries with a GPG key you own, which adds a powerful proving weapon to your arsenal, but that may be too hardcore for some.