A collection of pen pal sites for children: http://www.zen.org/~brendan/kids-pen.html
World Pen Pals: http://www.world-pen-pals.com/
A pen pals site for English, French, and Spanish: http://www.penpalsnet.com.ar/
ePals.com Classroom Exchange (English, French, Spanish, Portuguese, German): http://www.epals.com/
Intercultural E-mail Classroom Connections: http://www.iecc.org/
International Pen Friends: http://www.europa-pages.com/penpal_form.html
Andy's Pen Pals: http://www.andys-penpals.com/
Kidscom Page with a lot of features for children: http://www.kidscom.com/home_flash.html
Student Letter Exchange: http://www.pen-pal.com/
A girl's world - pen pals: http://www.agirlsworld.com/penpal/index.html
Christian Pen Pals: http://christianpenpals.com/
How to find pen pals: http://www.siec.k12.in.us/~west/online/coll1a.htm
Data is taken from: e-LISA academy, Education Highway, 2005

eTwinning Handbuch: teach.etwinninghandbuch.pdf [1.345 KB]
Published in April 2007 by: Central Support Service for eTwinning, European Schoolnet, Rue de Trèves 61, B-1040 Brussels Belgium
The eTwinning project aims to encourage European schools to collaborate using Information and Communication Technologies (ICT). The project was born under the European Union's eLearning programme and it now part of the Lifelong Learning Programme.
The main concept behind eTwinning is that schools are paired with another school elsewhere in the Europe. The two schools then communicate using the Internet (for example, by e-mail or video conferencing) to collaborate, share and learn from each other. eTwinning encourages and develops ICT skills as the main activities inherently use information technology. Being 'twinned' with a foreign school also encourages cross-cultural exchanges of knowledge, fosters students' intercultural awareness, and improves their communication skills.
Definition taken from: http://en.wikipedia.org/wiki/ETwinning