Nowadays it seems like every time I go to a conference I get one of those faux mountain climbing clips with an endorsement/company name on it. I had three hanging down in the hallway for at least a year. I took them to work today, careful to remind the person I gave them to that they aren't for climbing.
I remember when people gave sticky notes and awesome pens out at conferences. I miss those days. You can't ever go wrong with sticky notes and pens and you can never have too many. One you have more than one climbing clip - as I use one for my keys - you're pretty much set.