I often hear from the Mac users that Macs don't need to worry about viruses, keyloggers, and their kin and they point to their rock-solid FreeBSD core as proof. While I agree that OS X is far more secure than its popular counter-part, as OS X becomes more popular the malware writers will begin to target Macs. The worst badware of them all is the keylogger: if one ever gets installed on your machine you could have all your passwords cherry picked in no time!
The way in which the Subversion client manages your working copy has undergone radical changes. The .svn/entries file is no longer XML, and the client has become smarter about the way it manages and stores property metadata.
It is great to see the widespread obsession with XML is finally going away — XML was way overused.
DMG (Disk Image) is the default format for distributing software on Mac OS X. Even if DMG is a standard, the way it is packaged is not. I downloaded a few popular programs and looked at how their disk image is designed.