With help from Bill Keller i just patched hotkey <ctrl>+D support into the Diigo Chrome Extension v1.6.3.0.

First find your Chrome Profile Folder: http://www.google.com/support/chrome/bin/answer.py?hl=en&answer=142059

Then replace the existing \Default\Extensions\oojbgadfejifecebmdnhhkbhdjaphole\1.6.3.0_0\js\content\diigolet.js with this one: diigolet.js (196.41 kb).

If you want to change the hotkey, just edit the file, look at the end and change bookmarkKeyChar.