Those of you who travel to Vegas should know about www.billhere.com, one of those nice, more-or-less altruistic web services. Billhere is, they say, a lifelong Las Vegas visitor who retired to his favorite city and now, mostly as a hobby, sends out a regular, advertising-free e-mail letter that's probably the most complete listing of who's about to play the town and what else is about to happen there. He also collects and distributes coupons for discounts and freebees, and if you sign up for his newsletter, he'll tell you how to browse his on-line coupon list. If you want any, he'll ship them to you for little more than the cost of postage. Very nice of him.