I roll with 5 taillights:

A Planet Bike Superflash; mounted on the fender, flashing.
Two generic blinkies; mounted on the V-racks of the Xtracycle, solid.
A X-fire (lane marker light/tail light combo, in tail light mode); mounted between the V-racks with a couple of toe straps, solid.
A Blackburn Mars 3.0; helmet mounted, solid.

I also rock a lighted reflective vest, a Whizzz reflector, rear reflective surfaces, and a home modded yellow area light at the top of my safety flag.

I have three lights on the front:

A 110 lumen (claimed) Coleman head band light; helmet mounted (obviously), not usually used.
A Blackburn Quadrant; mounted on my front rack.
A B&M Lumotec (bottle dynamo powered) mounted on the front rack.

Both front rack mounted lights have home made breakaway mounts.