I have an NTFS partition, on this partition I have all documents, images, music, etc, but I can't synchronize these folders with Ubuntu One.
You can symlink the folders to the Ubuntu One folder, but only if you are using Ubuntu to do the syncing. If you are syncing on Windows it will not work.
An example of how you can do this is:
You cannot synch the folders apparently. Use dropbox until U1 allows you to use symlinks.
You can bind the NTFS-folder to a folder of your home directory and then choose in Ubuntu One to sync.
To make the bind permanent, add this line to your fstab: