I can't find a link to it online, so maybe it is just in the print magazine for now. But there's a story in Outside this month by a 22:00/4-hour hobby jogger who decided to try to break five minutes in the mile. SPOILER ALERT:
He did it, in 4:59.4.
It's not a story that's going to win any Pulitzer prizes in journalism or revolutionize training, but it's kind of interesting in light of all the, "Can an average Joe run a x.xx (blank), given a year to train?" that get started around here.
As I recall, it took the writer about five or six months from just a general level of decent aerobic fitness to pull it off, but he worked his tail off.