J.E.L.E.D.

Jewish European Learning Experience Dot.net

Books on Rosh Hashanah and Jewish holidays: (Dutch)

JomJom

Wegwijs in het Jodendom

Van Adam tot Ezra

On the following sites, you can find more information on Rosh Hashana and Judaism in general:

http://www.ucalgary.ca/~elsegal/EliMahzor/EliMahzorGlossary.html#Rosh

http://wujs.org.il/index.php?option=com_content&task=view&id=153&Itemid=51

http://www.ou.org/chagim/roshhashannah/default.htm

http://ohr.edu/index.php

http://www.virtualjerusalem.com/judaism/

http://www.jewfaq.org