With a gallery I would read the fine print to make sure you retain copyright of your photos.
For distributing files and lately for storage, I use www.yousendit.com which is fast and easy to use. I mainly use it for distributing music recordings of our church band, which fits nicely in the 50GB per-file limit of the free account. It started off as a file sending service and the free account has files valid for 7 days, but recently they've added folders you can upload to. It is not really for automated backup (yet?), but works well for file storage and distribution. We also use it for distributing large CAD/CAM files to manufacturers.
I've had Drop Box, would not use it again.
EDIT: That is 50MB file limit, not 50GB file limit...