Jewish Holidays.Com
http://www.Jewishholidays.com/

YomTov - A class on the Jewish Holidays
http://www.torah.org/learning/yomtov

JSource - Jewish Holidays
http://www.us-israel.org/jsource/Judaism/holidays.html

Calendar of Jewish Holidays
http://bnaibrith.org/caln.html

JOI - Jewish Holidays
http://www.joi.org/celebrate/
Holiday pages for Rosh Hashanah, Yom Kippur, Sukkot,
Simchat Torah, Hanukkah, Purim, Pesach, and

JCN - Jewish Holidays
http://www.jcn18.com/?content=section42

High Holy Days on the Net
http://www.holidays.net/highholydays/

OU - Sabbat & Jewish Holidays
http://www.ou.org/chagim/

MSN Encarta - Hallel
http://encarta.msn.com/find/Concise.asp?ti=00CDB000

MSN Encarta - Shabuoth
http://encarta.msn.com/find/Concise.asp?ti=04CC5000

MSN Encarta - Purim
http://encarta.msn.com/find/Concise.asp?ti=02AF4000

Hanukkah on the Net
http://www.holidays.net/chanukah

Shavuot
http://www.his.com/~chabad/shavuot/

VBM Holiday Journals
http://www.vbm-torah.org/webarch.htm
 

Hannukah
http://www.caryn.com/holiday-Hspirit.html

Holidays and Holy Days
http://www.613.org/holiday.html

HaYom On-line Hebrew Calendar
http://world.std.com/~reinhold/dir/

Beth El on Purim
http://www.shamash.org/reform/uahc/congs/ma/ma002/purim.html

High Holy Days on the Net - Rosh Hashanah
http://www.holidays.net/highholydays/rosh.htm
 

Jewish 1000
http://www.jewish1000.com/welcome.html