Aish HaTorah
http://www.aish.com/holidays/passover/
Complete guide to Pesach themes, Halachah, Seder, kids introductions, games, recipes, crafts, songs, quiz, multimedia.

Chabad
http://www.chabad.org/holidays/passover/
Pesach preparation guide, insights, family fun, shiurim, recipes

Elimelech David Ha-Levi Web, Inc.
http://www.angelfire.com/pa2/passover/
Haggadah focuses; Sephardi and Ashkenazi Pesach/ Seder traditions; features for kids; 
Torah/Haftarah readings; trivia, recipes.

Jewfaq.Org
http://www.jewfaq.org/holidaya.htm
Overview explanation. Terms, music/songs.

Jewish Post of New York "Holidays on the Net"
http://www.holidays.net/passover/
Basic guide to Pesah, songs, music, cards

Jewish Theological Seminary
http://learn.jtsa.edu/passover/
Basic to intermediate, for families; text,visual, audio & interactive

My Jewish Learning

http://www.myjewishlearning.com/holidays/Passover.htm
Pesach companion: history, concepts, knowledge, quizzes

Ohr Somayach
http://ohr.edu/yhiy.php/holidays/pesach/
Pesach introductory thru intermediate for students & adults; themes, laws, history,
Seder, Ask a Rabbi, parshiot magazine, audio shiurim, fun stuff.

Orthodox Union (OU)
http://www.ou.org/chagim/pesach
Basic to advanced material; background and analysis

Temple Israel
http://tiwestport.org/passover/pesach.html
Introductory site to Pesah

Torah Org [Project Genesis]
http://torah.org/learning/yomtov/pesach/
Haggadah: learned commentary & FAQ for advanced students, adults;
insights; shiurim.

Totally Jewish

http://www.totallyjewish.com/pesach/kids/manistana/
Basic site with several links

UAHC Virtual Seder Plate

http://uahc.org/congs/nj/nj006/seder/plate.html
Basic ideas with visual interaction

Uncle Eli's Haggadah
http://www.ucalgary.ca/~elsegal/Uncle_Eli/Eli.html
General for children; rhyme/text with clipart, music

Virtual Bet Midrash
http://www.vbm-torah.org/pesach.htm
Shiurim for intermediate to advanced

Virtual

Jerusalem
http://www.virtualjerusalem.com/jewish_holidays/pesach/Home.htm
Meaning of Pesach, helpful resources for kids and adults

Yeshiva University
http://www.yutorah.org/showShiur.cfm/718051/____YUTORAH/Pesach-To-Go_5767
Pesach-To-Go educational package for families, schools, adults & Seder

613.org
http://www.613.org/pasclass.html
Audio files, lectures and songs

Happy Passover

http://www.happypassover.net

 Guide to Pesah, Prayer, songs, music, Recipes and more