A repository of ESL writing and projects developed by teachers from around the world.
http://www.otan.us/webfarm/emailproject/email.htm

EPALS Classroom Exchange is a free service developed to help teachers, parents and students around the world take advantage of new technologies that enhance and enrich learning experiences. Ready-made interesting projects make this site worth considering.
http://www.epals.com/

ESL/EFL student E-mail connection from Dave’s ESL Café
http://www.pacificnet.net/~sperling/student.html

St Olaf College has created the IECC (intercultural E-Mail Classroom Connections) mailing lists which provide a free teaching.com service to help teachers link with partners in other cultures and countries for email classroom pen-pal and other project exchanges.
http://www.teaching.com/iecc/