Aish Hatorah
http://aish.com/holidays/tu_bshvat/last/seder1.htm
Kabbalistic Seder
http://www.aish.com/tubshvat/tubshvatdefault/Kabbalistic_Tu_Bshvat_Seder.asp

Board of Jewish Education, New York
http://www.bjeny.org/pdf/judaic_curicula/tubshvat/Seder%20lTu%20BShvat%20-%20Older%20Children.pdf
(Focus on trees; suitable for younger children)

Education Department, Jewish Agency For Israel (French) 
http://www.jafi-ed.org.il/french/fetes/toubish/index.html

Hagshama Department, WZO
http://www.wzo.org.il/encountr/seder.htm

Jewish Theological Seminary of America
http://learn.jtsa.edu/topics/kids/together/tubshevat/seder.shtml

JOFA on Ritual Well
http://www.ritualwell.org/holidays/primaryobject.2005-06-27.4628874103
(Outline texts for Seder for Adults; focus on species of Eretz Yisrael and 4 cups)

Shema Yisrael
http://www.shemayisrael.com/tubshevat/TuBShevat.pdf
(4 cups, fruits)

Haggadah

Bar Ilan University, Lookstein Center
http://www.lookstein.org/resources/seder_derovan.pdf

Coalition on the Environment and Jewish Life
http://www.coejl.org/tubshvat/celebrate/tubshabhag.pdf
(Three spiritual worlds)

Israel Ministry of Education & Culture
http://cms.education.gov.il/EducationCMS/Units/Moe/TuBishvat/seder/ShaarStav.htm
(Hebrew. 4 seasons = 4 cups; 7 species; 4 sons; traditional and Israeli poetry)

Ivrit Type
http://www.ivritype.com/toolkits/tubstk12.pdf
(traditional and modern verse)

Jewish Community Online
http://www.jewish.com/holidays/tbv_hag2.html

Virtual Jerusalem
http://www.virtualjerusalem.com/jewish_holidays/tubshvat/seder1.htm 
(4 Questions; 4 cups; 7 species and traditional texts)