10 Reasons why Apple's successes are good for Linux
Conz at Eye on IT has posted an article explaining why he thinks that OS X's increasing market share is not only a good thing for Apple, but a good thing for Linux. Futhermore, the post states that there are many reasons (10 in particular) that OS X is not a threat to Linux in the near or long term.
A few of the reasons are a little far fetched, like the idea that Mac users will switch to Linux (some might, I suppose, but not many), however, this is worth a read and it is a refreshing look at the OS battleground.