For anyone interested in Second Life Education (SLED) I urge you to join their respective listserve mailing lists. The SLED community has been thriving for several years and can provide a great bit of knowledge. Have a question about Second Life? Search the archives!
SLED listserve: https://lists.secondlife.com/cgi-bin/mailman/listinfo/educators
SLED Archives: http://www.google.com/coop/cse?cx=001010425210852223575%3Ajldmgpuier0
SLED Wiki: http://www.simteach.com/wiki/index.php?title=Second_Life_Education_Wiki
SL has recently started a listserve for anyone making or interested in machinima.
Machinima listserve: https://lists.secondlife.com/cgi-bin/mailman/listinfo/machinima