My virtual staff and I have been using a really nifty tool called DropBox to share documents and keep track of their latest versions.  It integrates nicely into your Windows file system where you can create any number of folders and subfolders.  You can then “share” these by sending an invite to those who you want to give access to a particular folder.  And best of all, the service is free for the first two gigs of space.

Here’s how it works.  Suppose you are working on a document (say, Word or Excel) and then put it into your one of your drobbox folders.  DropBox will immediately upload it to their servers and then automatically download to those with whom you shared that folder.  Also, any time you make a change to a particular document, it stores the previous version should you ever need to go back to earlier one.

We (i.e. Vickie, Lisa, Robin and myself in addition to some outside virtual consultants) have found it to be totally seamless to use (since you only use the Windows file browser like you normally would) and it creates a perfect way to share and collaborate on documents.

NOTE: always do your own due dilligence prior to using any product or service.