I noticed that you said "photos". For Photos, we have been using a pro account on flickr since we started. We have one account, and share it with everyone on the team. It's remarkable to capture and archive team memories.
http://www.flickr.com/photos/teamthr...1/collections/
For other files, documents, PDF's etc, we use dropbox and it works well for us too.
I forgot to mention, since we use WordPress on our website, there is a flickr plugin that just brings the photos from flickr, right to our website.
http://huntingtonrobotics.org/photos/