There is a gap between IM/chat and email and documents, specifically in regard to remote team collaboration. That was one of the strengths of Google Wave, except that Wave had a learning and familiarity threshold people weren't willing to climb over. There's a huge opportunity there for a startup that I haven't seen anybody really tackling yet.

You can't get away from the value of face to face meetings though. If it is possible, getting face to face occasionally is a huge benefit in strengthening relationships in a team. In the end, teams are about relationships. Remote teams work great, and I prefer them to co-located teams, but figuring out a way to meet in person on occasion is worth the effort.