Just wanted to share these really quick. I helped redesign my agency's business cards. We only have a few people in the agency who need lots of business cards, but we had been in the habit of printing hundreds of cards for everyone.
In the new system, we have kraft chipboard shells with generic information for our two offices. You check the box for your office and fill in the space for your extension. Each employee has a custom printed sticker to fit onto the card. When we get a new hire or promotion, we can just print new stickers instead of whole new cards.
Apparently these cards were a big hit at a conference recently. In an environment where attendees are swarmed with free trinkets, they were coming to our booth specifically for our business cards. Neat!