I spent some time exploring eRoom today, and I wasn't all that impressed. Maybe I need the full client instead of the web client. SharePoint Services, while better than the prior version, still hasn't done much to impress me yet either. And while Groove's feature set looks impressive, it's architecture gives me pause.
While I have more looking to do at these products and perhaps others in this space, I am sorely disappointed. This is clearly a big corporate need. Why can't somebody deliver a tool that just knocks your socks off?