What Russ says is true but for me it was simpler. I used Plan 9 as my local operating system for a year or so after joining Google, but it was just too inconvenient to live on a machine without a C++ compiler, without good NFS and SSH support, and especially without a web browser. I switched to Linux but found it very buggy (the main problem was most likely a bad graphics board and/or driver, but still) and my main collaborator (Robert Griesemer) had done the ground work to get a Mac working as a primary machine inside Google, and Russ had plan9port up, so I pushed plan9port onto the Mac and have been there ever since, quite happily. Nowadays Apples are officially supported so it's become easy, workwise.
I miss a lot of what Plan 9 did for me, but the concerns at work override that. -rob
