There seem to be a few people asking about addon bits for pronto, so ill start it off with a
RGB LED controller , Serial in and 6 channels of PWM LED controll, if any one wants mor info PM me, ( how do i add photo's to this thread?)
also
www.ikonavs.com have a range of Podules that will take serial in/out and convert to 0~10V dc and a few Open colletors + mains rated relays plus a few more bits....