The authors of the highly successful series of Warner titles called The Rules, Ellen Fein and Sherrie Schneider, have become consultants in the area of women's relationships, offering seminars and, naturally, a busy Web site. Out of the latter they have gained the realization, in the past two years, that a vast amount of the activity connected with such relationships is now conducted online, via a large number of sites and chat rooms. Hence their new title: The Rules for Online Dating (and/or Just E-mailing Men) . Agent Mary Tahan at Clausen, Mays & Tahan sold world rights in the book at auction to Pocket Books senior editor Mitchell Ivers. The plan is to publish next summer, as a lead title in Pocket's new original trade paperback publishing program.