I'd love to see a blog post that says, this is how to setup X (I dunno.. mediawiki, owncloud, whatever).. and then go fully in-depth into _everything_ surrounding it.. security, backups, logging, alerting, monitoring, backup testing/restoration etc.. a blog post that really covers everything for a well-protected 21st century hosted application that won't leave the owner in tears after a year!
There's honestly so many posts that make it look so easy, but without everything else that would normally make it a job position in a company :)