THE FIRST SIGN THAT SOMETHING WAS wrong came Sunday afternoon, when I logged on to the Internet to check my weekend E-mail and found that someone had enrolled me in a Barry Manilow fan club, a Mercedes-owners discussion group, a Fiji Islands--appreciation society and 103 other Internet mailing lists I'd never heard of. I knew from experience that any one of these lists can generate 50 messages a day. To avoid a deluge of junk E-mail, I painstakingly unsubscribed from all 106--even Barry Manilow's--only to log on Monday morning and discover I'd been subscribed overnight to 1,700 more. My file of...

