My guess is that the platform vendors like MS SharePoint and Lotus Connections will end up dominating this space over time (next 5 years or so) - touting the the "same old" enterprise-wide platform spin. Similar to what SAP did in the ERP days. Good luck to Jive as they try and compete "head to head" in the enterprise-wide space with these giants and their enormous marketing budgets, reseller channels and customer base.
One emerging market in the E2.0 space that you didn't mention in your article - is the use of social software to faciliate team collaboration via business communities. For me, this is where I think the biggest business benefit of social software is for any organization. Why? Because people don't work alone all day, they work on teams, on projects, committees and are members of functional departmental business units.
Many of our customers are using our business social software suite to connect their teams - inside and out. Deployments are bottom up (employee driven = adoption), focused (around specific business activity or pain point) and range in size from 25 users to over 1,000 users. This distributed approach not only aligns very well with the Web 2.0 movement, but also helps to minimize risk by implementing smaller, cost effective and user driven social business deployments.
