Sukkot Central - This site from the Cyber Home of Torah includes an introduction to the holiday and many explanations of the different aspects of celebrating Sukkot. Seventy Oxen is a brief explanation of why Sukkot is important to all of the nations and not just Israel. (T)
Feast of Tabernacles - From Biblical Holidays' website includes links to Jewish Customs, Messiah in Tabernacles, and Celebrating Tabernacles. (T)
Sukkot Basics - A good introduction to the customs of Sukkot from Jewish Heritage online magazine (not Messianic) (T)
Sukkot Recipes - A large list of recipes from Cyber-Kitchen.com. (T)
The Jewish Year Educator's guide - From Virtual Jerusalem, this guide makes discovering the Jewish holidays "a fun and interactive learning experience for your students". (Y, M, O, T)
Rosh Hashana, Yom Kippur, and Sukkot - From Jewish Kids Online (Y, M, O, T)