yeah - I agree... if he doesn't know it (and might never know) then it would only be fair, since we know the machine is in this state (still assuming the owner doesn't know it)... it's like knowing there's a robbery happening but just diving in and helping yourself otherwise...
ok, bad example but you guys know what I mean :p
Edit: another few ports -
1002/tcp open windows icfw?
1720/tcp open ms-rdp (Microsoft Terminal Service - NetMeeting, Remote Desktop, Remote Assistance)