I run 3 rear flashers - a DiNotte 140 (very, very bright), plus two Planet Bike Superflash.
I also have plenty of non-flashing reflective gear on myself and the bike (red reflective conspicuity tape on the fenders, white reflective tape on the crank arms, yellow reflective leg and arm bands, and a fluorescent yellow green safety vest with 2" wide white reflective strips all the way around).
Between the active and passive systems, I'm quite sure that I can easily be seen and identified as a bike. If anyone claims they didn't see me...I'll own them in court.