I own an Olympus E-PL1 and I love the camera but one thing I wish it has is a remote shutter release.
I first wanted to make a mechanical shutter release adapter similar to ones for the Sigma DP1 (http://www.amazon.com/Mechanical-Release-Adapter-exposure-photograph/dp/B003JFMYWA/ref=pd_rhf_p_t_2), but I would still need to buy a mechanical shutter release.
Looking through my closet for usable junk, I found my old remote control car which uses a servo for steering and a bunch of Legos.
I mounted the servo to the hot-shoe portion of a broken flash unit and I control the servo with an Arduino.
I programed the Arduino so that the system can be used as an intervalometer. The blue button on the left is used to enter the duration in seconds and the button on the right starts the shutter action. The RF module sitting on the board will be used later to release the shutter from a distance.