I modified a bit identica-mode.el, instead of

(defvar identica-username nil)
(defvar identica-password nil)

I put

;; from twitter.el:
(defcustom identica-username nil
“Username to use for connecting to identi.ca.
If nil, you will be prompted.”
:type ‘(choice (const :tag “Ask” nil) (string))
:group ‘identica)

(defcustom identica-password nil
“Password to use for connecting to identi.ca.
If nil, you will be prompted.”
:type ‘(choice (const :tag “Ask” nil) (string))
:group ‘identica)

Like this you can avoid the need to write your password in your .emacs, which is something we all like to share .

Like i said in comment, this code come from the twitter.el package ).

Thanks you for this identi.ca mode !