Ruby mode 

Package add:

rsense 
ruby-block
smex
sr-speedbar
ruby-end
auto-complete
redo+

Command:
comment-or-uncomment-current-line-or-region (yeahhh very very usefull)

Align command !!! 
  - align-to-colon 
  - align-to-comma
  - align-to-equals align-to-hash ( => ) 
  - align-to-comma-before

ruby-interpolate