Dereliction Addiction isn't one I see mentioned often, but there again it looks to be a very small community of people watching his videos.
https://www.youtub...hotography1/videos I found him when I was younger from his website that gave some really good first time/rookie urban exploration advice. Probably not useful for experienced people but it serves a very good first-timers crash course.
http://www.urbanxp...y.co.uk/urbex-faqs