as per http://www.ebay.com.au/gds/How-to-Choos ... 179/g.html
It's an LED 'bulb' unit that goes in your indicator, but you wire it to your parkers, so you get extra light when your parkers are on. Not really sure if this would be worth it, has anyone done it, or seen it done on any cars? (in AU or elsewhere)
I'm not sure it adds a whole lot, but I want to test it out first.