"Conference badge design" sounds really as the next on-the-edge experience :)))
Anyway you're right, it wasn't easy finding people
A number of people have commented about the difficulties in networking. Perhaps it might be a good idea in the future to:
1) make them bigger so you can see people's names
2) color-code them by occupation/interest so you can see at a glance who is who
3) icons: country flags for one, would be helpful so, again you can see who is who
Since this is a Web 2.0 conference, I think a healthy challenge would be to try and apply the principles we are familiar with online to the physical world. Like Kathy has asked, I think the reason so many people are primarily here is to meet each other and forge the offline relationship that still feeds the online ones.
Other ideas for the badges? (Thanks to Gleb Kaplun for initially suggesting badge color-coding)
Yes, making the name bigger would be useful. Also, designing the badge so that it stays "face up" at all times would help: with the current design, almost half of the time the badge is "face down". Simple solution: have the badges pinned, like in the good old days.
François Dongier