One of my favorite features of the DuckDuckGo search engine (a USV portfolio company) is the instant answer. The instant answer is the box at the top that gives you what you were looking for. For Fred Wilson, it looks like this:
So Gabe, the founder of DDG, hacked up a way for users to contribute instant answers. He calls it DuckDuckHack. And he created a Twitter account where he publishes all the Instant Answer hacks. Yesterday "mstratman" created a hack that generates QR codes. Here's the QR code for avc.com.
And this hack tells you what the currency is in a country.
If you use DDG, then you should absolutely follow the Twitter account and get tips on cool instant answer hacks. But more than anything, this shows how Gabe is thinking about making DDG better and I like that.