If you've got 10 minutes, you can learn the history of English — including some interesting background on where specific words and phrases came from. (If you don't have 10 minutes, you can also watch the whole thing one chapter at a time in less-than-two-minute segments.) Interesting note: The equal importance of both The King James Bible and early scientific publications/societies to the formation of English as we speak it today.
I lived in Birmingham, Ala., for two years right out of college. While I was there, I became convinced that y'all is a reasonable and necessary word — a simple form of the plural "you" for a language that has no vosotros. Don't like "y'all" on principle? That's okay. There's a large diversity of grammatically-awkward-but-conversationally-necessary plural yous for English — a fact which makes me even more convinced that I'm right. Sometimes, y'all need a y'all. (Via mental_floss — ironically, the reason I was in Birmingham, to begin with — and Matthew Francis)