ctrl-r <register> pastes that register into your command. So I often need to find "where is this method defined" across a large project. yw (yank word to

ctrl-r <register> pastes that register into your command. So I often need to find "where is this method defined" across a large project. yw (yank word to get method into the " register) :Ack <ctrl-r>" (ack plugin, paste that default " register) <enter> yay! I found it. Alternately: /foo (attempt to find foo in this file. Whoops, not there, where is it!). :Ack <ctrl-r>/ (last search is in the / register). There it is!