Well, the big hold up was that previously it was only for 1.5 and 1.6 devices, and only on low res 320x480 screens.
Now that the Desire ROM has been leaked, it should be a bit smoother sailing, even though it is still only 800x480 (the Droid is 854x480).
The HTC keyboard has already been ported, and while it's really nice, it FC's when put into landscape or using the hardware keyboard.
The Desire dump is still prerelease, so it has HTC warnings all over it, but once we get a good Desire or Incredible dump, I think a Sense port to the Droid is unavoidable.