Hacker News on 4 December 2009

• Why I gave away my company to charity
• Google acquires AppJet/Etherpad
• Analyzing Y Combinator
• Ack - better than grep, a power search tool for programmers
• Google Dictionary
• No one gets fired for hiring IBM - how our pitch was stolen from us
• Saying "NO"
• Webapp: image recognition to find nearest tennis courts from satellite photos
• Three lessons I learnt from porting Diablo
• Ask HN: alternatives to EtherPad?