Wow this thread was so much help. I bought a nut filing kit on ebay for 25 dollars. Pretty decent quality, it gets the job done that's for sure.
http://cgi.ebay.com/ws/eBayISAPI.dll...m=110323826104
Well worth it IMO, way cheaper than those 80 dollar ones. I didn't have to go out to buy them, and it came with a set of very helpful instructions. My Taylor 610 plays so well now, and it's not sharp on the low e anymore.