There's also the optofluidic "microscope-on-a-chip": http://deviceguru.com/cal-tech-unveils-microsopic-microscope/ http://deviceguru.com/cal-tech-unveils-micro

There's also the optofluidic "microscope-on-a-chip": http://deviceguru.com/cal-tech-unveils-microsopic-microscope/ http://deviceguru.com/cal-tech-unveils-microsopic-microscope... The lensless optics are similar to the cellphone microscope, except that there is virtually no distance between the sample and the sensor. Also, the sensor is a one-dimensional array of CCDs; the sample is "scanned" by propelling it over the array in a stream of fluid.