Judaism 101: Tisha B'Av
Day of mourning to commemorate the many tragedies that have befallen the Jewish people.
www.jewfaq.org/holidayd.htm
Wikipedia: Tisha B'Av
User-edited article about the Jewish holiday Tisha B'Av.
en.wikipedia.org/wiki/Tisha_B'Av
Tisha B'Av & The Three Weeks
Period of national mourning, focusing on disasters that befell the Jewish People throughout history.
aish.com/holidays/tisha_bav_and_the_3_weeks/last/main.htm
Tisha B'Av - The Ninth Day of Av
Tisha B'Av (the ninth day in the Jewish month of Av) is a day of mourning during which Jewish people fast. The holiday primarily commemorates the destruction of the first and second temples.
judaism.about.com/library/3_holidays/tishabav/bl_tishabav.htm
OU.org: Tisha B'Av
The saddest day on the Jewish calendar.
www.ou.org/yerushalayim/tishabav
Ohr Somayach: Tisha B'Av & The Three Weeks
Laws and rituals, poetry and riddles, Talmudic insights, audio lectures, and more for the holiday.
www.ohr.org.il/special/9av/index.htm
Hillel.org: Tisha B'Av
Information on Tish B'Av, the second most severe fast day of the Jewish calendar.
www.hillel.org/jewish/holidays/tishabav/default