Again, my congrats and my admiration to the efforts made to compile all this valuable information and to share it!
I’ve been through your list, some sites I do know, like Voicethread (which I like a-priori, would love to try it with stds!), and Edublogs.
I have been working with Vance Stevens on a project on tagging, which I find tremendously useful for easy connection between like-minded people… And for that any blog would do. I also keep sticking to blogs, as they give teachers a good control (sorry about this trail of traditional teaching left…;-)) mainly when it’s students’ first incursion in technology and need a lot backing and support)

I have several tools bookmarked to peruse in detail, like Daft Doggy Voice Recording, which allows you to record up to 6 hours of voice recording and save it to our servers. http://www.daftdoggy.com/recorder/record.php

And Mind42 (beta) , which allows teachers and students to share and modify mindmaps on line, and also to export them in a few different formats, at http://www.mind42.com/

And we could go on and on…

Nice having met you online, hope we can work on a project together.

Rita