add this to your .emacs to get nice indenting for Om methods (as defined by om-tools).

emacs.el

(defvar om-methods
  (list 'render
        'render-state
        'init-state
        'will-mount
        'should-update
        'will-receive-props
        'will-update
        'display-name
        'will-unmount)
  "Methods that should receive sexy clojure indents.")

(dolist (v om-methods)
  (put-clojure-indent v 'defun))