Dr. Nurit Reshef
http://www.ualberta.ca/~yreshef/tuintro.htm
Ohr Someyach
http://www.ohr.org.il/special/tubshvat/index.htm
SusieQ Tu B'Shvat
http://ourworld.compuserve.com/homepages/Susieq/2bshvat.htm
Chabad
http://www.his.com/~chabad/tu/
Torah.org
http://www.torah.org/learning/yomtov/tubshvat.htm
Jewish Outreach Initiative
http://www.joi.org/joiscripts/dgssearch/search.php?q=Tu+&r=10
JTSA Kid's Corner
http://www.learn.jtsa.edu/topics/kids/together/tubshevat/
Orthodox Union
http://www.ou.org/chagim/roshchodesh/shevat/tubshevat.htm
Torahtots
http://www.torahtots.com/holidays/tubshvat/tubshvat.htm
WZO Hagshama
http://www.wzo.org.il/encountr/tubish.htm