See the announcement here: http://www.thecomethunter.com/
Don's web site is a wealth of information, on comets as well as on general astronomy. Don runs well organized star parties and is one of the pioneers of the Messier Marathon, a special star party where participants try to see as many Messier objects (from a list of 110) in one night. Among the things you'll find there are a free download of one of Don's books, A Decade of Comets.
Don has had to develop a technique to give himself the best possible chances of discovering comets "by eye" to beat the space-based and other professional instruments to the discovery. Anyone with an interest can be a comet hunter, however, and Don shares his techniques. In one case recently, a German amateur astronomer discovered a new comet by happenstance while trying out a new telescope.