This week's book giveaway is in the Performance forum. We're giving away four copies of The Java Performance Companion and have Charlie Hunt, Monica Beckwith, Poonam Parhar, & Bengt Rutisson on-line! See this thread for details.
by default, CTRL-D deletes the current line. to change any keystrokes go to Window->Preferences->General->Keys-> find CTRL-D and click EDIT. Remove "delete" from the list. Find "duplicate lines" in the dropdown list of actions. Click Add and then Apply