Zoho launched a new service “Zoho Dicussions” that let you create online communities forum hosted on Zoho.com. Once created, you can customize your forum with subtopics, logo, favicon, and other minor tweaks. The basic service is free and lets you create up to 2 forums and 2 sub forums. You also get 100MB for file attachments. You can also pay $25 to $75 a month for more storage space and the ability to create and manage more forums. Zoho Dicussions include the ability to bookmark a topic, add tags to a topic, or subscribe to the RSS feed for a forum.
More info: Zoho Discussions