Not my startup (unfortunately) but my friend just launched his company that he has been working on for a couple of years: www.tradechase.com<p>It's like a stock-market simulator, but you play short games against each other - like trying to make the most money in 30min with £100,000.<p>They have a UK Gambling licence so you can place bets on each game (no US gamblers allowed I'm afraid - I think you can play non-cash games).<p>I think it's a pretty damn cool product - I gave them lots of feedback in the early days so I'd love to hear what the HN crowd thinks now that they are launched.