Printing discount codes on your business card
When you're running a startup you get asked for your business card. A lot. While you're still in private beta and are controlling how many people can access your app it's fairly common to send people an invitation code, which they can use on your sign up page to get access to your app. That's what I've done with Agile Planner. Why not hand out invite codes on your business card?
I'm now using GraphicsMagick and Moo to print a unique invite code on each business card, which provides everybody I hand my card to with their own unique invite. It also makes my card more valuable than it would be if it all it had on it were my contact details, which should increase the likelihood that potential customers will visit the site and join my mailing list.
Here are the cards:
Fancy doing it yourself?