A little bit of elisp for outputting the form in the repl buffer in front of output. (a la Tim Baldridge's Clojure/conj 2013 core.async presentation).

nrepl-eval-form-to-repl.el

;; Works with nrepl-0.1.6.el

(defun my-form-printing-handler (buffer form)
  (lexical-let ((form form))
    (nrepl-make-response-handler buffer
                                 (lambda (buffer value)
                                   (nrepl-emit-result buffer (format "%s" form) t)
                                   (nrepl-emit-result buffer (format "%s" value) t))
                                 (lambda (buffer out)
                                   (nrepl-emit-output buffer out t))
                                 (lambda (buffer err)
                                   (nrepl-emit-output buffer err t))
                                 (lambda (buffer)
                                   (nrepl-emit-prompt buffer)))))

(defun my-interactive-eval-to-repl (form)
  (let ((buffer nrepl-nrepl-buffer))
  (nrepl-send-string form (my-form-printing-handler buffer form) nrepl-buffer-ns)))

(defun my-eval-last-expression-to-repl ()
  (interactive)
  (my-interactive-eval-to-repl (nrepl-last-expression)))

(defun my-eval-expression-at-point (&optional prefix)
  "Evaluate the current toplevel form."
  (interactive "P")
  (let ((form (nrepl-expression-at-point)))
    (if prefix
        (nrepl-interactive-eval-print form)
      (my-interactive-eval-to-repl form))))

(add-hook 'nrepl-interaction-mode-hook
          (lambda ()
            (nrepl-turn-on-eldoc-mode)
            (enable-paredit-mode)
            (define-key nrepl-interaction-mode-map
              (kbd "C-x C-e") 'my-eval-last-expression-to-repl)
            (define-key nrepl-interaction-mode-map
              (kbd "C-M-x") 'my-eval-expression-at-point)))