Just released:
http://www.microsoft.com/windowsmobile/devicecenter.mspx
A 12.5 megs download.
No need no manually uninstall WMDC 6.0
I installed it with my Pocket PC (iPAQ 2750) connected and WMDC 6.0 running.
WMDC 6.1 installer took care of everything and no reboot was needed!
Carlos