An online real-time multi-user document editor - you can create documents without signing in. Very nicely done.

Hosted wiki and collaboration.

Quoted: As the Enterprise 2.0 leader, Socialtext applies Web 2.0 technologies to the critical challenges facing businesses. Enterprise 2.0 holds the promise of dramatically increasing business productivity, stimulating greater innovation, and creating tighter connections between employees, partners, and customers. Socialtext provides hosted and appliance-based solutions to more than 5,000 customers world-wide. Socialtext's flagship product, Socialtext Workspace, is the first enterprise wiki and the foundation of the connected collaboration platform. Socialtext People enables enterprise social networking. Socialtext Dashboard provides personalized and customizable widget-based interface for people and teams to manage attention. SocialCalc is the social spreadsheet for distributed teams. These products deliver connected collaboration as a service. Adoption and achievement services leverage this platform to deliver rapid implementation of market leading solutions.

Hosted SharePoint is being offered by Microsoft as Office Live.

Quoted: Free web hosting, free e-mail, and web services from Microsoft Office Live

37signals launched their real-time group chat service (Campfire) today (Feb 2006).

Ray Ozzie's company - purchased by MS in 2005.

Quoted: Groove Networks. Groove Virtual Office v3.0 is software that allows teams of people to work together over a network as if they were in the same physical location.

Quoted: What's the idea behind Flock? We believe that it should be easy for everyone to contribute to and participate on the web. To that end, ...