Okay I guess one last blog/buzz about business cards.
How to make one yourself:
1. Find a QR code generator. I like this one because it lets you set error correction levels.
2. Set error correction as high as possible (that is, it'll have more dots, some of which are redundant in case some fool smudges or tears or writes all over the middle of it.)
3. Input what you want to pop up when someone scans it. If you want the code to represent just a bit of text or a URL, fine. But if you want more structured data (like a bunch of contact info) you can use specially formatted strings. Here's a guide to the types. And if you want contact info in particular, you can use the MECARD format (details here). So, for example, the text embedded in that QR code is:
(kinda think some of those ;'s are unnecessary)
4. Write all over the middle of it. Seriously, just in Paint or GIMP or something.
5. Make sure it still works.
Here's another person's guide that says the same things.