It's a bit similar to what I had done in a learning experience that was a six week online course - see Collaborative Learning Using Web 2.0 Tools - A Summary.
Lots of interesting aspects: using blogger to direct people in the course - each lesson is a blog entry - and participants used blogs to communicate as well. Result:
In total 222 staff members completed the discovery learning quest and the
program has been picked up by libraries both nationally and world wide.
I also somehow ran across Matt's Learning 2.0 Blog where he's going through steps very similar to 23 Things. There's something really nice about this pattern!