Despite all the new and more or less established collaboration and sharing tools, the one I use most of all is Google Docs. Yes, it is still buggy but I have found it to be the fastest and the most reliable. Besides, on the plus side I never need to login to it (as I am always logged in to my Google account) and it has exactly the set of features I need (no extra ones and almost no missing ones). If you are using Google Docs regularly (or plan to start),