Even as the light has long dimmed on the dotcom boom, and the feverish partying is now just a faint hangover, the technology crowd is massing once more. But this time, instead of clamouring at the bar at a packed-out First Tuesday event, Britain’s e-business people are hitting the web sites before hitting the bars. This time it’s not about WANs, Wi-Fi or wireless networking, but real live networking, enhanced