since I am more used to Windows where ctrl-c is copy, I followed other people's suggestion and mapped ctrl-x to do what ctrl-c usually does, with:
stty intr ^X -ixon
This is because X and C are very close, and I couldn't sacrifice ctrl-v (paste) or ctrl-z (background) while I seldom use ctrl-c
I'm sure you could do the same with ctrl-d if you really wanted to.