Us ethe internet to collaborate internationally on projects that make a difference to the world. i first joined some of these in Australia in the 90s...
Main benefit I see is that it can hold "Posts" for moderation like comments are currently held. So teachers don't have to worry about inappropriate content getting out there, but students can post robust content.
Effective school and district leaders driving the innovations;
Collaboration and participation in professional communities;
Use of data to improve instructional approaches;
Subject matter expertise;
The sustainability of the programs; and
Access to resources and tools.
Interesting links particularly on student blogging and podcasts... including Spark (Canada) a collaborative podcast, radio show and blog around technology and culture
Excellent video that be used to help schools going through the envisioning process of moving forward as a 21st century learning community. Don't be turned of by the Microsoft logo.