A minor digression: the apples/laptops ratio is stunningly high. I had to look carefully to check that speakers had not just shared the same Mac.
I was there with my Zenbook (running Arch). A few guys with macs made comments about it, “ahh, I see you've got the Macbook Air ripoff.” in a condescending tone.
A witty retort eluded me, so I said "Yup." like a plank.
Yup. At the last two DjangoCons in the US, if you got up on stage you basically had a sea of glowing Apple logos staring back at you.
I found that at previous PyCon US that I attended, Macbooks made up about 75-80% of the laptops. I imagine its pretty similar at Rails conferences.