My wife and I both have Macbook Airs with relatively limited internal hard disks. If we could just offload our iPhoto libraries, we'd be fine.

What are some of the cloud storage options for iPhoto? Meaning, when I open iPhoto, everything feels local, but is really stored in the cloud.

Note:

1.) This thread talks about wireless NAS as an option, which might be a better way to go. enter link description here 2.) I'm talking about using the cloud as primary storage, not as a backup.