I have no experience with chiropractics, but I know a lot of folks swear by it, and I'll be honest, the thought of messing with a newborn's joints and skeletal system just seems very counterintuitive to me. In an attempt to learn more, I googled it too, and I also found lots of sites saying it's a safe and helpful practice for newborns...all of these sites were sponsored by chiropractors. In my quick search, I didn't see any non-chiroprator-sponsored studies on the topic, but I would certainly encourage you to seek out information from the opposing side (if any exists; I dunno!) just so you can make an informed decision based on a broad base of both biased and non-biased (if it's available, I dunno!) information.
At any rate, congrats on your newborn, good luck, and as always, enjoy your kids!
(As a P.S. to all the other posters so far -- I'm somewhat relieved to hear there are so many positive experiences with chiropractics out there. I'm getting the sense that it's super-helpful for adults...I'm just still skeeved out by the inclusion of babies, sorry! Call it my weird instinct. Glad your experiences have been positive though! :)