If you aren't already a fan of this non-profit, local, grassroots, urban forest advocacy group, check out the LEAF site. Not-to-be-missed: their Tree Tenders workshop, Toronto Tree Tours, Backyard Tree Planting Program & factsheets. While you're there, sign up for their newsletter. You don't want to miss out!
I've used some of their resources before (love 'em), but last night was my first experience with their Tree Tenders workshop. Already I can't recommend it enough. And I can't imagine a more sincere, interesting and knowledgable instructor than Todd Irvine. If Todd hugs trees, I hope the trees hug him back!