Good news for those of use who like to use google docs to collaborate on documents as it now supports the office 2007 file formats docx and xlsx. More info here: http://googledocs.blogspot.com/2009/06/file-formats-keep-on-coming-announcing.html I like the dropbox service myself: https://www.getdropbox.com/referrals/NTU5NDg3Njk