Cathy Relf has a great blog on sub-editing. I particularly recommend her post on spatial awareness training for editorial staff.
Oh, and while I’m on the subject of People Being Crap With Language, the other day I was editing something that contained the phrase “female parents”. I’ll never know how I managed it but I was, eventually, able to trim this down to a single word.
And, just as I typed the above, my colleague C came across this gem: “The venue also offers baby-hanging facilities.”
Update 15/7/10: I've closed comments on this post owing to a plague of spambots.