Education links from the book 'Second Life: The official guide':
The official forum for educators using Second Life
Using Virtual Worlds in Education Programs
Second Life groups to join:
Real Life Education in Second Life (a Linden Lab sponsored group)
Educator's Coffee House
Educators new to SL
(There are also a few specific groups according to location and age group.)
To obtain freebies of relevance to educators
Misc. Other...
Educational Uses of Second Life wiki page.
50 Tips to Create a Learning Space in Second Life
Read the SLED Picayune, a weekly inworld publication about Real Life Education in Second Life.
Pick up the latest copy at this kiosk... http://slurl.com/secondlife/Info%20Island/54/202/34