How to monitor what Ubuntu One is doing?
How can I watch the activity of Ubuntu One?
Is it possible to see a detailed list of uploads, downloads and so on?
Can I see a list of unsynced files?
You should install magicicada. That shows you in detail exactly what Ubuntu One file sync is doing at any moment and what's queued up to happen.
You can see its log and see what it is doing, if you want to see the network activity you could use programs like wireshark to track the activity of a certain program
The unsynced files are at: