Some of the bloggers over at ScienceBlogs have been chatting recently about open access publishing. It's no surprise that bloggers (we write for free) think that open access is a good idea, if not absolutely required. I think that Tara's and Bora's entries are the most illuminating: both in content and Bora's in sheer volume. Check them out so that you can build your arsenal of talking points.
And by the way, the next time YOU publish, consider using one of the 2814 open access journals available for submission. I put a link to the directory of open access journals down in my sidebar, too.