I've never really recieved a unique business card from anyone but if people handed out more creative business cards like these it would definitely be fun to collect.

Much respect for the designers of these business cards. Now there's some real talent.

Nice business card design. Trippy. I've seen another business card like that though by Stephen Sagmeister. I think it operates on the same principle (by the lines and moving the card inside.)

I like the M++ card but it looks like it's going to be really expensive to produce more than ten of those. And a set back will be you really have to take care not to get the part that attaches to the usb scratched or it might not work. Really nice idea anyway.