Online Collaboration

I am seeing online collaboration more and more and I expect that it will continue to increase in the future.
Some ways I use it now:
- Students who are working in pairs or on group projects can collaborate without having to share usernames/passwords. This helps when students are at home or absent.
- Teachers in the same content area or across content areas can plan collaboratively even when they don't have shared planning time.
Some ways I would like to use it:
- Planning and comparing notes with paraeducators and special educators. Our schedules never coordinate, so we are often catching up on the fly.  If we collaborated using something like Google Docs or PB Works, we could more easily address student needs.
- Parent conferences with multiple teachers.  Teachers could all share information about students, including progress reports, and parents could respond. This could be more efficient than excessive emailing with "Reply to All".
How do you use online collaboration?