Spot on!

Spotme.com, describing the networking devices:

“Spotme combines social networking via a searchable photo database, messaging, people radar, unique “Spotting” function and electronic business card exchange, with audience response, Q&A sessions, messaging, lead retrieval, attendance tracking, electronic feedback forms (and more) to create the only all-in-one communication service for events of all sorts - from 200 to 5000 participants.“

The Spotme looks much like a Pda or a Blackberry but you can't use it as a phone (though that function will possibly be activated in the future).
One of the most useful things the device provides is a full program of the conference including more information about speakers and presentations.
An important network-help is the radar-function: you can scroll through the list with participants, secretly find out who's sitting next to you, which interesting company-delegates are nearby,...
You can send messages, add meetings with other people at the conference,...
Exchanging electronic business cards is a piece of cake, you can exchange these by simply holding Spotme-devices against each other!
Taking notes.

After the conference, you receive a login by mail, all the information you've saved during the conference, can be downloaded!

Watch the video: http://www.youtube.com/watch?v=InCgOz835Hk