Quoted from Pii I tend to do Creative Commons, as I support the ideology of free flow of information without screwing myself for all that I have.

Never heard of this site before...
I'll have to grab my pick axe and goggles for a look see.

http://creativecommons.org/

Regards,
E.D.

No need to copyright and/or LOC your very first draft.  Only register the draft you intend to send out to people (i.e., script consultants, managers, agents, producers, etc.), which could be your second, third or tenth draft.  

Also keep in mind: If you ever have the need to go to court over a copyright issue, your best bet is copyright with LOC.  WGA registration apparently doesn't help a heck of a lot should you end up in court, especially if you make a claim for damages.