O.K., so I am totally out of sync! Having already used Google Docs I thought I would move on to Dropbox to compare the two. Took rather a long time to download, in fact I had just about given up and moved on to looking at Jing when it decided to open.
It seems to me that Google Docs has the advantage that a lot more people I know use it than use Dropbox, not that that is a reason to use GD if Dropbox is better. We in the team in the library are currently looking at Sharepoint as well, so that would also be added to the list. I think Dropbox does look an easy to use and useful resource and will look initially at using it for saving documents which I regularly update both at work and in the house.