First off I'd like to point out that I hate the term "blog" and conjunctions like "blogcards" pain me even more.
Anyway, Hugh MacLeod does these fantastic cartoons on the back of business cards. Now you can buy "blogcards". Basically a business card type thing with one of his cartoons on the back and your choice of colour and text on front. A trendy business card substitute thing. I now am the proud owner of some that I can't link to because of the stupid PHP site.