A Straight or a Twisted Shofar? - Staff at the Bar-Ilan University's Parashat Hashavua Study Center discusses what kind of ram's horn to use as a shofar. - http://www.biu.ac.il/JH/Parasha/eng/rosh/fis.html
Chabad.org - Rosh Hashanah - Contains information about services, study, stories and recipes. Includes Kids section. Features Find-a-Service and E-Shanah Tovah cards. Also covers Ten Days of Repentance. - http://chabad.org/holidays/JewishNewYear/template.asp?AID=4644
Rosh HaShanah with Torah.org - Project Genesis has educational resources, observances, and recipes. - http://roshhashanah.torah.org/
The Virtual Beit Midrash - A series of advanced lectures on Rosh HaShana, both philosophical and halachic. A resource for the serious student. - http://www.vbm-torah.org/rosh.htm
OU Presents Rosh HaShana - About the holiday, as well as advanced articles. Also includes a collection of audio links. - http://www.ou.org/chagim/roshhashannah/