Mac: Hopefully, you're backing up all your data in multiple places. This might include using both Dropbox and Box, or Flickr and Picasa, or whatever else. This redundancy is great, but it's hard to actually browse all those files sometimes. Cloud Commander helps organize it all.
When you first load up Cloud Commander, you're shown all your various cloud storage services. From there, you can easily browse each folder, organize your files, and do pretty much anything else you can do with Finder. The nice part of Cloud Commander is having it all in one place. You can connect to all your cloud services in one place, view everything at once, and easily check your storage for each at a glance. From there, you can look at files, move things around, or Quick Look at anything inside the folders.
Cloud Commander ($4.99) | Mac App Store via MacWorld