Bongo Network: Current news and discussion forum.
Tanzanet: Online community of Tanzanians from around the world. News, discussion forums.
The Bongoland Project: Online community for Tanzanians all over the globe. Includes chat, discussion forums, and photo gallery.
Ujambo: Meeting Place for people. Search rate and chat to members.
Yahoo! Groups - Tanzania: Directory of online communities connected with or interested in the country.