This being a small community, I think it would definitely be nice to be able to get to know all of the members individually. And the intro post is just what it sounds like - for you to introduce yourself, tell us a bit about yourself, your interests, what you do, etc. Don't forget to include SPN-related stuff too, like you favourite episode, what you believe to be the scariest monster-of-the-week, how you started watching... the list goes on. :D
One thing though: Please avoid going in-depth into season two topics, if you're planning on talking about SPN. There may be people who haven't watched it yet, and it's only fair we give them a chance. :)
That's all I can think for now. xD So start commenting!