Wonderful goodbye post by my buddy Alex Bain on his exit from Apple to go to Facebook. This is how you do it. And it's clear how much he loves Apple. My favorite part was this little story embedded in the broader post about the last time he left Apple.
"When I left Apple the first time, in 2006, I emailed Steve Jobs on my last day, thanking him and telling him I'd pass along the lessons I'd learned to classmates in grad school, to which he replied (16 minutes later):
Well, you could also come back when you're done!