Serious OSX exploit!
A very serious exploit has been discovered on OSX, and everyone using Safari or any other browser on OSX (even FireFox or IE) are urged to follow the instructions here so they can temporarily stop the exploit from working, at least until Apple gets its act together and fixes the problem. The fact that Apple have still not fixed the problem, which they have been aware of since February strikes me as a very stupid thing to do. I don’t know if fixing the exploit would require many in-depth changes to the OS and maybe that’s why it’s taking so long for Apple to fix. One would hope that this is indeed the case. They should have at least warned their users about this a long time ago. Leaving an exploit unpatched like this for such a long time looks really bad for them, especially in enterprise environments where I hear they are trying to make serious inroads.
It seems the HFS+ file system on OSX is quite good at keeping file fragmentation at bay, almost eliminating it altogether in most cases! Amit Singh has a great article about it here.
A colleague at work asked me today how OSX’s Mail.app does it’s spam filtering and this appeared as if just by coincidence 
Created by the engineers who bring the Japanese input method and the Speech technologies to you, Mail’s junk mail filters are outstanding. When trained for a sufficient period of time, the filters can reach 98%+ accuracy against spam and are surprisingly painless to use. In fact, this feature alone has convinced many users to switch to Mail.
The first part of that article is also pretty good, a lot of good stuff about spam, picking good email addresses, etc.
Update: These guys have released a program to fix the OSX exploit.