I have been using Google doc since 2007 with 2 other co workers who live 2 hrs away and we meet every 3 months for a meeting to discuss our tasks. We use it to create agenda, add the minutes and currently for setting up a new library link site.
It has been great to use the google doc as a working document instead of relying only on emails to track which steps need to be taken next. We have all been working on our different tasks, marking them done and can see where the whole project is on a daily base.
This thing I like a lot
We also use a wiki. Instructions for the computer set ups are on the wiki and I have a place to go back to an find help without calling first. I have just this week learned how to upload new documents.