Poll: How often do you scan QR Codes?

At SXSW, QR codes were everywhere. On buses, backpacks, business cards, t-shirts, you name it. But I've never once scanned one, or seen someone scanning one. Maybe it's because I have an iPhone? It seems Droid people are a little more comfortable with them but I wanted to pool the HN community to see if I should start using them in my marketing.