When you start to write for computer publications, one of the first lessons you learn is that your readers are guys. The percentage of guy-ness has always been one of the big differences between the magazines and Web sites, but the range was always ran from between 90 percent male readership to 60 percent male readership. Women, it was said, didn't care about technology.

Sadly, this seemed to carry over to the Web. In the early days of the Internet and the World Wide Web, only about 35 percent of the people online were women.

Yet as the Web became more and more mainstream, the percentage of women online steadily increased. Now MediaMetrix is announcing that in the first three months of this year, 50.4 percent of the American Internet audience was female.

These statistics are nothing less than the final argument that the Web is a mainstream medium. Marketers know this. A record or movie won't be a hit unless women buy it; you think it's an accident that there have been far more cute manufactured boy bands than chick groups in the last 30 years or so? Men can be counted on to embrace stuff for its gadget value. Women tend to come along when they understand that it's useful.

MediaMetrix's figures bear that out. They indicate that women come online to do something specific -- research, shop, chat. Men come online to ... well, just to be online. This makes perfect sense to me. Contrast the way women use a TV remote control against the way men use one. Men watch TV; women watch programs on TV.

This is a wonderful trend. Gadgets come and go. Media with genuine usefulness stick around. (Ever try to do serious business over a CB radio?) And the presence of women online in proportions that mirror their presence in the general population is the strongest indicator yet that those of us building the online world are not wasting our time creating a fad.