I just ordered a set of Moo MiniCards, after having been reminded by Erik of their existence. And then I got to browsing this flickr group and realized what a huge thing they are to some people, who go to great lengths to design them and trade them. Check out the notes from hopeful traders, for instance here.
I don’t think I’ll go that far, but Erik’s set looks cool, and above all, it’s nice to have some very personal business cards for the business of me – just representing my personal activities and creativity online, disregarding where I might work. I’m really looking forward to getting mine.