Sugarsync.
Syncs photos, videos, and folders to the cloud. Those can be synced to about any other device.
Up to 5GB free.
I really like it over Dropbox.
Most people don't want every photo they take to upload automatically.
But Picasa sync has been in Android since Dirt. Long press a bunch of photos in the Gallery and share to your free Picasa account.
Why would you need another application for this?
No Google+ account required.
There's a whole bunch of them: FolderSync, Dropin, Titanium Media Sync, Sweet Home.
I have tested all of those, some are limited to just photos and videos, others to only a small set of cloud services.
I chose FolderSync, which connects to many different cloud services, including Dropbox, Box, SugarSync; it does any type of file; it will sync on wifi, power or a schedule. It's pretty sweet!