Syncing with Ubuntu One works like a charm for me. As the lazy person, I am I wish I the N900 could sync automatically, so I wouldn't need to remember to push the sync button after every change.
To reduce costs would be nice to have options like this: If the options are there already, maybe somebody can point me in the proper direction? After some research I found related Code: Bug 10943 - Provide a possibility to synchronize via CLI command that is more than 6 month old. Any news?
Bug 10943 - Provide a possibility to synchronize via CLI command