I have written about variations on the generic business card including magnets, mouse pads, memory sticks and added benefit. Here is the Business Card Ideas.
I'm glad people are getting more creative with business cards, it's about time! Business cards can really convert networking into clients so it's worth the effort to perfect your design.
I read an article some time ago about a guy who switched his business card from horizontal to vertical display. Just that little change helped him a ton with networking because more people commented on it, instead of glancing at it and putting it in the back of their wallet.