I've been commuting to work for a couple weeks on the Christiania. I started riding it more regularly when I was taking the girls to school, then it just seemed more convenient with all the cargo space and ease of locking up. I don't even mind the ride home up the hill so much any more!
It was sort of scary riding home in the dark until I got my act together a bit... I found the strange Danish light that slides onto a mount in on the front of the box, started wearing my reflecty vest with my Cateye flasher on my collar, and I just got a nice Planet Bike headlight for my helmet.
The helmet light is the big revelation. It was only $30 or so, but it's wonderfully bright. It's also amazing to be able to see wherever I'm pointing my noggin!
Last night, I needed to decompress a bit and the weather was nice, so I rode all the way up the bike path to Arlington Heights before riding up Park Ave. (I usually go up Highland and Gray, which saves a couple miles.) Because it was only about 6 but still pitch black, the path had lots of bike traffic, and everyone was all bedecked in lights and visi-wear. It was really fun seeing the reflecty patches go by and seeing how all the light combos worked. Unsurprisingly, the lycra-clad riders on $5k racing bikes all have VERY bright rechargeable lights to match. Most seem to have more modest arrangements like me. The surface was completely leaf-covered in most parts, and I definitely felt safer on three wheels.
Better make the most of it while the weather cooperates!