Muslim Message

An online community for Muslims offering a forum and opportunities to create blogs. Includes a number of special groups, including one for the Muslim Writers' Society.
http://www.muslimmessage.net/

Gateway to Islam

A Yahoo group, aimed at deepening understanding of Islam; for Muslims and non-Muslims.
http://groups.yahoo.com/group/gateway-to-islam/

Islam Awareness Club

Yahoo! group for non-Muslims to learn about Islam and for general discussion.
http://groups.yahoo.com/group/islamawarenessclub/

Islamica Community

Online discussion forum for Muslims.
http://www.islamicaweb.com/

Muslim Domain

A forum for discussing current affairs concerning Islam. Includes news, and links to software downloads.
http://www.muslimdomain.net/

Learning Islam Together

A discussion forum to help new Muslims and non-Muslims wanting to learn about Islam.
http://pub117.ezboard.com/blearningislamtogether

Islamic Forum

A moderated forum for discussion of topics of Muslim interest.
http://www.gawaher.com

Islam Message

A forum covering a range of topics on Muslim practice and belief, and current affairs.
http://www.islammessage.com/bb/

Islam4all

A discussion forum on MSN; includes articles introducing Islam.
http://groups.msn.com/islam4all

Sunni Forum

A forum for discussion based upon on the four Madhhabs (Islamic schools of thought).
http://www.sunniforum.com/

Islam Forum

A discussion forum promoting Muslim unity.
http://www.islamicboard.com/

Islamic Pen Pals

A searchable database of people seeking Islamic pen pals.
http://www.jugon.com/penpals/

Talk About Islam

A collection of forums discussing Islam, and religious belief and practice.
http://www.talkaboutislam.com/

Sunniport

An Ahlusunna portal and forums.
http://www.sunniport.com/