Maltby on error handling in Solaris
Gavin's talking about Solaris and its error handling in his blog. Go, read.
His most recent entry talks about the philosophy behind error handling, but his previous post is nice too (though, I'm perhaps just narcissistic and happy to see SMF get a mention), and I'm already looking forward to future posts. If his internal communication is anything to go by, I'll often be reading while thinking "hey, that's a much clearer description of what I was trying to convey".