I have created a list of, currently, 300+ educators using twitter. Mainly tweeting about technology in education. If anyone wishes to be added or removed from the list, please tweet me (@deerwood) or DM me.
The list can be viewed at @deerwood/EdTech or http://twitter.com/deerwood/edtech
If anyone knows of any other similar lists on Twitter, please post them here for all to share.