I've linked to over 2,000 US community access TV stations in a Google Doc spreadsheet & online database. Seeing Occupy Boston's post this morning, I thought your readers might like to see these. The "public" access centers especially (more than the "education" & "government" ones) are indeed wonderful media resources you can use, mostly for free. The database - http://CommunityMediaDatabase.org - requires a free log-in account to search; the spreadsheet - http://bit.ly/boopXY - does not require a log-in.
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Virginia Beach, VA