No personal relationship. Don't approach young adult ministry as a program. Young adults need to be approached as individuals searching for meaning and depth in their lives. You hit on something with computers, though. Many Xers have used the computer since grade school.
Email is the primary vehicle for communication.
The Episcopal Church has WAY underutilized the Internet. The Internet needs to be used to help young people get connected. Their website offers mechanisms for young adults to get informed, connected, and stay connected. They have attracted tens of thousands of young adults from all over the Washington DC area in just a few years. A huge percentage of their attendees never attended any church before.