MacOSX -> GNU/Linux
I used a part of the money that I earned on the SoC 2007 to buy a laptop to me. My university friends found a good price of a MacBook and we went to the shop in a total of 6 people (!) to buy this laptop trying to get some discount. It cost R$ 3400 (about USD 1800), a very cheap value to the Brazil standards.
Fine. My MacBook arrived one week ago. The shiny laptop is cool, but the OS really not. I tried to accustom myself for at least one week with that OS and I failed. The reason why is better explained by these guys below:
Why Install Linux on Your Mac? http://www.oreilly.com/pub/a/mac/2004/11/30/linux.html
Switching Back to Desktop Linux http://www.linuxdevcenter.com/pub/a/linux/2006/06/01/switching-back.html
When the bough breaks http://diveintomark.org/archives/2006/06/02/when-the-bough-breaks
Long life for the freedesktop’s :)