I have placed many skype calls (skype to skype and skype-out calls) now on the N800 with this latest firmware and while wearing the mono BT Motorola Headset.

Incoming call are answered without needing to touch the N800, I press the button on the headset, and I can end calls without touching the N800 also. The volume controls on the BT headset control volume levels in Skype properly ( but are a bit sluggish in response ).

Unfortunately, Skype calls cannot be INITIATED from the headset. I am quite pleased they can be answered and terminated from the headset though.

The Skype / Nokia bug that plagued the previous N800 OS (OS2007) where the screen failed to dim properly ( after time ) has been fixed also. Now after you place a Skype-Out call the screen dims and blackens as it should. Excellent.