I remember reading an article (I think in Wired magazine) years ago about the parent company for Trader Joe's, but I'd forgotten about it until I saw this Freakonomics post:

The company is called Aldi and, though I’d seen one or two of its stores in the past, I didn’t even know it was a grocery store. Then I read this very interesting Wall Street Journal piece about the company’s ambitious new plan for the U.S., which calls for 75 new stores this year. The article claims that Aldi is so good at selling cheap goods that WalMart couldn’t compete with it in Germany.

So, for those of you waiting with bated breath for Trader Joe's to announce a store opening in Winston-Salem or Greensboro, you can already shop at its big brother's stores.  Here's a handy-dandy list of locations for you.