In my first visit to Silicon Valley in 2007, one of the hosts of the "Super Happy Dev House" hackathon said he saw as many Macs as PCs at the event for the first time.<p>First, the release of new Intel-based MacBook Pros around that time enabled developers to try OS X while taking Windows along with them.<p>Second, the new Intel MacBook Pro became the best Windows laptop, rivaling the keyboard of IBM Thinkpads but with a much better display.<p>Third, students got a one-time 25% discount on any Mac if they joined the Student Developer program for OS X, making prices more reasonable.<p>Fourth, the success of the iTunes App Store a year later made purchasing a Mac a no-brainer for iOS developers.<p>Fifth, hundreds of dollars of discounts and free iPod Touches have been offered to students for many years, many of whom have graduated and brought the Mac to their workplace and replaced them with new Macs.<p>Sixth, the release and refinement of the ultra-thin and light MacBook Air over the years culminated in affordable 2011 models that people could take with them wherever they went, such as hackathons, thus further 'advertising' the Mac to observers like you.<p>Seventh, the general reduction in price of Macs over the years, the improvements in the operating system like Time Machine and cheap upgrades between major releases, tie-ins with iPhone, iPad, iTunes, and iCloud, and the cool factor of owning a Mac are many factors which also contributed to increased ownership of Apple products.<p>Edit: from reading other responses to this question, I agree that hardware features like compatibility with Linux distros and the multi-touch trackpad have been amazing advantages of the Mac as well.