I am running 11.10 on a Dell D600 laptop and I uploaded files to my Ubuntu One account from my desktop.
I would like to download them to the laptop. I can access my cloud from the laptop but I don't know how to download the files.
Can you connect to Ubuntu One (on your laptop) from the Messaging menu?
(it's the icon in the upper-right that looks like an envelope)
Once you are connected, click on the "Cloud Folders" tab to get a list of your currently sync'd folders. I know for 11.04, it syncs everything with the "Ubuntu One" directory (on your home directory).
If you try that and you're still having issues, here is a link for Ubuntu One help that is specific to 11.04 and 11.10.