A new (at least to me) social networking paper from folks at HP's Information Dynamics Laboratory, Bernardo Huberman and Lada Adamic. "Information Dynamics in the Networked World."
You know, if you really want to be on the leading edge of this stuff, you need to keep an eye on the physicists. That is if you can handle the math.
Update: Alex Halavais e-mailed to chide me for possibly slighting any traditional social network analysts out there. No slight intended, those folks have been on the leading edge of this stuff for decades. Hope you're not in a tizzy!