OneDrive for Mac is the easiest way to access OneDrive files on your Mac.
When you install it, a folder is created on your computer. Everything you then place in the folder is automatically kept in sync between your computers both Mac, PC and OneDrive.com. This means you can access your files anytime, anywhere. You can access your files directly from Finder meaning its very easy to transfer and manage photos, documents, and all your other important files.
One annoying thing is that the icon stays in your Dock while you are managing files. However, you can manually hide it from the Dock using Terminal by typing "defaults write /Applications/OneDrive.app/Contents/Info.plist LSUIElement 1". You may need to restart the client if it was already running.
Note that in April 2012, Microsoft announced a reduction in free SkyDrive storage for new users to just 7GB unless you are a current user and specifically opt to keep the 25GB storage limit.
OneDrive for Mac is an essential download for users of the service.