Times they are a-changin (grammatically)

I'll begin with a nerdy post:

Aside from the obvious. For the English nerds among us!

The headline today on MSN reads: "A Historic Day of Transition."

I remember being taught that, grammatically, it would be correct to say: "An Historic Day of Transition." Its not that I necessarily agree with it. Thats just what I've always thought because its what I learned long ago.

http://www.theslot.com/a-an.html argues differently.

Where does it lead? When society collectively decides to disregard the rules of language its a slippery slope toward lol txt language. Lol, huh?

At least this explains to my satisfaction the presidential oath of office snafu: http://tinyurl.com/dmg4bm

Currently listening: The Times They Are A-Changin' By Bob Dylan