[toyg]

The trend is undeniable, but there's some selection bias in your post: people with Macs do tend to flaunt them around, especially at geek gatherings where you find a lot of contractors/independent/superstar/fashion-victim developers who have a say in the hardware they use. You don't see the thousands of corporate developers with work-issued laptops nor the academic working on "big rigs"; they're not all uber-hackers but they're not all shit either. Apple adoption is also lower in Europe due to higher prices compared to NA and Japan.

Last few times I've been to (Euro) Python conventions, I was actually surprised to see a lot of really skilled guys doing real computation (3d, molecular modelling etc) while happily running Windows on their laptops.