Skype An Author

http://skypeanauthor.wetpaint.com

Sue Water's The Edublogger

http://theedublogger.edublogs.org/want-to-connect-with-other-classrooms/

Video Conferencing Out on a Lim

Janine Lim 

http://vcoutonalim.org/

School Library Journal

8/1/2009

"Met Any Good Authors Lately? Classroom author visits can happen via Skype (here's a list of those who do it for free) by Kate Messner

http://www.schoollibraryjournal.com/article/CA6673572.html

School Library Journal

"See Me, Hear Me""  conducting an author visit via Skype

by Carolyn Foote

http://www.schoollibraryjournal.com/article/CA6515247.html

Use the MERLOT Virtual Speaker's Bureau (geared more toward higher education folks)