The HTC HD Mini features a pretty nice lock screen, as can be seen from the video above.
Michyprima has now made the software available as a cab, which I have tested on the HTC HD2 and found to work pretty well.
Michyprima warns that the PIN lock screen however no longer works, so if you use this security on your phone this cab will not be suitable.
Download the cab here.
Thanks Fotone for the tip.