Some TeamLearning subscribers might be  be interested in a recent 
post "Re: The value of email discussion lists"  [Hake (2009)].  The 
abstract reads:

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ABSTRACT: I list some of the advantages of email discussion lists as 
given in posts titled "The value of email discussion lists" by Gerald 
Grow (2009) of the JOURNET list and Dave Dillard (2009a,b) of the 
NET-GOLD list. In addition, I enumerate some strengths of Academic 
Discussion Lists as given in "Over Two-Hundred Education & Science 
Blogs" by Hake (2009a) of the PhysLrnR list].
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To access the complete 15 kB post please click on <http://tinyurl.com/yawxua9>.

Richard Hake, Emeritus Professor of Physics, Indiana University
24245 Hatteras Street, Woodland Hills, CA 91367
Honorary Member, Curmudgeon Lodge of Deventer, The Netherlands.
<[log in to unmask]>
<http://www.physics.indiana.edu/~hake/>
<http://www.physics.indiana.edu/~sdi/>
<http://HakesEdStuff.blogspot.com/>

REFERENCES
Hake, R.R. 2009. "Re: The value of email discussion lists," online on 
the OPEN! AERA-L archives at <http://tinyurl.com/yawxua9>.  Post of 
23 Nov 2009 12:07:47-0800 to AERA-L, JOURNET, & Net-Gold.