Ryan: It's best to use the right license for the right purpose. The GPL is designed to be a license for code. It doesn't make sense when interpreted for something like textual content, or images, or other types of creative works. For those, a different license might be more appropriate.

Not that you can't apply any license to any work, it's just unclear as to intent in some cases. CC license are great for text/images/etc. They don't make much sense for code though. A more code-specific license applies better in those cases.