Islami City
Islami city.com: The Five Pillars of Islam
This website provides basic information on each of the Five Pillars of Islam, "the framework of the Muslim Life" - faith, prayer, "zakat," fast, and pilgrimage.
PBS
Islam: Empire of Faith: Five Pillars
Follow each of the five links to gain a deeper understanding of the Five Pillars of Islam.
Other
Royal Embassy of Saudi Arabia: The Five Pillars of Islam
An objective explanation of the Five Pillars of Islam, which are a Muslim's primary obligations in his or her lifetime.
BBC
Bbc: Religions: Five Pillars of Islam
Brief explanations of each of the Five Pillars of Islam, with links to more detailed accounts.