Hacker News on 4 April 2011

• Tron Legacy: how the special effects were done
• Show HN: my weekend project, Gumroad
• How to find startup ideas that make money
• Sshuttle - tunnel all your traffic through ssh
• Introducing the New Commodore 64
• Show HN: My weekend project, tracking the services you can't have in Canada
• Facebook Ads: The Cheapest Traffic You'll Ever Buy
• The Möbius Gear
• Patents and innovation
• On Tesla's induction motor