I chap passed me on a bike last night whilst I was walking and I noticed that he was very well illuminated and appeared to have rear/red lights on his handlebar ends, and very effective they were too...these are what I assume he must have had fitted as they are the only ones I can find on the on-line sites. They were very good and noticeable. They would only work on drop handlebars though. Would be great if you could have indicators like this save you taking your hands off the bars.
http://www.wiggle.co.uk/tacx-lumos-front-and-rear-led-handlebar-light-set/