We have issued yammer for internal communication on project teams to allow for more immediate collaboration versus the extra time needed to setup phone calls and meetings. We have found it helps to resolve potential issues sooner and also has been a great tool for virtual teams.

We have also used collaborate wikis to promote discussion on items where stakeholder input is needed to weigh in to help solidify requirements and resolve uncertainties. We have found the add’l benefit being that the stakeholders are more bought into the process/solution.