"... Put them into a “networking” twitter list and stay on top of what they’re doing. Send them helpful resources and retweet resources they put out. ..." This

"... Put them into a “networking” twitter list and stay on top of what they’re doing. Send them helpful resources and retweet resources they put out. ..." This would probably make the beginning a good startup idea. If you do/don't have a card but do have a twit id a simple app to notify people you have met & manage the contacts (as long as you remember/record/contact their twit handles) - sort of an online business card. Stacks of contact apps have been built like this way but linking both the online/offline would be innovative. But nothing beats having something physical to put in someones hand without the need to sling out your phone/computer. I use moo cards of flickr images ~ ~ http://www.flickr.com/photos/bootload/sets/72157616147825654/with/3661538477/ http://www.flickr.com/photos/bootload/sets/72157616147825654... Unique, cheap & good looking they get the right information across. They are cheap enough for me to order a new batch every year with images I've taken making each one individual. By letting users select an image each is personalised.