My HS computer classes have been blogging around the theme "We must be the change we wish to see in the world" for a couple of weeks now (as part of our Digital Citizenship unit). We are looking for other classes who would be willing to occasionally comment on our blog until the end of January. We would in turn, make comments on your blogs - like a Comment Challenge. Many of our posts embed Web 2.0 tools or are interactive.
My 8th grade students will also be participating but are just getting started and don't have any posts yet.
You can check out our blog portal at http://vcs.21classes.com
Please email me at email@example.com if you are interested.