I think it would be really interesting to collect whatever sites/resources you discover for being an effective on-line instructional professional and make them available. I also wonder if there isn't a community for on-line instructors--in fact, there may be several.
For sure, start a group here (or a forum discussion) for on-line instructors so you can have a conversation that helps you find those things!
Being a technology teacher, it becomes easy to get into the rut of praising technology at all times and for all situations. However, it is important for a teacher to know that pedagogy comes first. This year, that has been my focus - to ensure that I am progressing in my general teaching practice as well and not just ideas for technology integration. There are a plethora of ideas out there already - how to use them effectively and in keeping with the principles of teaching and learning is the key. Currently in the later half of my Masters of Education from University of Toronto, I tried to take courses that would enhance me holistically as an educator.