I recently received an email inquiring about Creative Commons and Wiki. Here is my take...
CC and wiki - the short of it is..."We the Media"
Wiki - is an online open-ended database. Any user, any browser - can become an editor. The simplest way to share information and evolve web usage. Two extreme contrasts are wikipedia.org and urbandictionary.com. Both allow for user-defined content, one will kill the encyclopedia; the other will kill brain cells.
CC is in short, sharing information. Original copyright laws limit the building upon of content, the Creative Commons organization formed to try to return to what they think our founding fathers intended to do with Copyright.
An interesting guy to look at is Cory Doctorow. His latest work "Someone Comes to Town, Someone Leaves Town" was published in CC and actually launched in several electronic formats including the iPod and PSP. Cory believes that the more he gives away the more he will earn, and actually has created a model that backs up his theory, apparently. He is using a version of the CC called iCommons, which has been adopted by something like 21 countries since late 2004. What this means is that you can download the book in the states, but you can actually print that thing for profit in other countries. This is essentially a utopian belief that by giving your work away to underprivileged countries for their gain will bring them up to the lifestyle we enjoy here in North America, and therefore we all win. Good book if you like science fiction, I read it on my PSP- for free!
Speech he gave about Creative Commons - http://craphound.com/ebooksneitherenorbooks.txt
Then of course, there is copyleft, the idea is that every person who receives a version of the software, music, document, or art can adapt it change it, and re-purpose the item from it's original version. And then they must ensure that they copyleft the work so that the circle can be repeated. Very ideological in it's very nature.