The Urban Geek As A Mugger Magnet?

CGP314 writes "I live in London and whenever I travel around, I feel like a huge target for muggers. Usually I take my laptop, iPod, cell phone and occasionally a PDA around with me. As with many geeks, these items hold within them far more value to me than anything I leave behind in my apartment. So I would like to know what my fellow urban geeks do to try and keep their valuables safe while traveling with them. I've switched my iPod headphones from the distinctive white to a boring black as a means of camouflage; are there any other suggestions?"