Cut, Copy & Paste Files Between Dropbox, Google Docs, SugarSync, FTP & WebDAV
Otixo connects your favorite services (like Dropbox, Box, Google Docs, SkyDrive, S3, SugarSync, FTP, etc.) so that you can access all your online files in once.It’s mostly useful for cloud users who are using more tan one cloud service to backup their files to online storage.
All you will need to do is sign up for free otixo account and there you have to authorize otixo to use your online storage accounts.Say on clicking dropbox icon, you will asked to authorize otixo to use your dropbox account.Its as simple as we are adding multiple chat accounts on single messenger.
You can add your Dropbox, Google Docs, Box, SkyDrive, SugarSync, Picasa, MobileMe, and Amazon S3 accounts as well as WebDAV and FTP accounts there.After authorizing your online accounts, you can simpley copy, paste and move your files across the online cloud storage accounts.All you need to do is just right-click on a file to share, launch, copy/paste, download, and more.
Otixo gives you a centralized view of all your online files stored on different cloud accounts.It allow you to perform easy copying and pasting between accounts from the web interface or through a mapped drive on your desktop.You can easily view your online accounts stored files as folder in your otixo accounts.You can easily manage your online files just like you are performing the work on your computer.
Otixo Features:
- Associate Dropbox, Google Docs, Box, SkyDrive, SugarSync, Picasa, MobileMe, and Amazon S3 WebDAV and FTP accounts as well.
- Easy to use & free to sign up.
- Timesaver web apps for cloud users.
You can check out Otixo @ http://otixo.com

Tried it but fount it flaky. Found another service called SMEStorage, which supports many more clouds. There are some decent videos on YouTube outlining File and Folder move between Clouds:
http://www.youtube.com/watch?v=m20ROX5L-fE&feature=youtube_gdata_player
http://www.youtube.com/watch?v=cBhRESi2Mv0&feature=youtube_gdata_player
SMEstorage is a nice service. i like CloudKafe too.