I mentioned "http://subdomain.", so the context was the web server.
It's mostly the local development server, where I set up different sub-domains to point to different web applications. (application.local.ourdomain.tld)
What you suggest I might do on the live server though, at the moment I just use a wildcard - But for the record, Slashdot doesn't handle www.apple.slashdot.org either.