I'm a fan of the planet bike lights. I have one of these on the front: http://www.teamestrogen.com/prodPB_3029.html -I like it because it slides off easily so I don't always have to have a light on my bike. I have this on the back: http://www.teamestrogen.com/prodPB_2008.html. I've had people tell me they can see be from waaaaaay back at night with that. Woohoo!