it’s a sort of hobby/obsession of mine, i’ve started riding at dusk/night, mainly because it’s dark when i get home from work, to that end, i’ve been on a sort of “quest” to get the bike as lit up as possible for maximum safety, since night biking is marginally riskier than day riding (due to reduced visibility to cars), i’ve added the following lights to the bike (Trek 4500 MTB w/ slicks)
Front;
bar-mounted Cygolite Rover NIMH 12.5 watt halogen
Blackburn Quadrant 4 LED light (as my “being seen” front blinkie)
i have a spare Cygolite Metro (basically a Rover that uses standard D-cells instead of a NIMH “Bottle” battery) that i’m either going to mount on the other side of the bar to replace the Blackburn Quadrant, and stow the Quad, in my Camelbak for an emergency backup light, or mount the Metro to my helmet
Rear;
on the seatpost, top to bottom;
VistaLite Safety Light (big reflector/LED combo, 3 modes, solid, flash, chase (“Cylon/K.I.T.T.” mode) 
i keep it in “Cylon” mode
CatEye TL-D1000 more on this light later…
Trek Disco Inferno visible for up to 1-2 miles away
right seatstay; another Disco Inferno
Anyway, back to the point of the thread…
i thought the Trek Disco Inferno was the best light, it’s really good, but the CatEye TL-D1000 is so much brighter, it’s scary, at arms length, i can look into the Disco with no discomfort, but it HURTS to look directly at the CatEye, and that’s during the day no less, at night, it’s even nastier
it’s got 2 banks of 5 lights, top and bottom row, for a total of 10 LED’s, 6 face directly backwards, and 4 point out the sides, it has 4 flash modes (flash, solid, “Cylon”, random), and each bank of LED’s can be controlled seperately, you could have one row solid, the other row flashing one of the flash modes, or have them both flashing, different patterns even, (flash/cylon, cylon/random, random/random… you get the point)
this thing is just bright, evil, and nasty, any driver that claims he “didn’t see me” must be lying, or legaly blind…