Lifehacker's got some interesting tips this week, from putting your club cards into iPhone form, to making a water bottle into a juicer (homeless style), and building your own outdoor theater. They also have something about knots.
• Know your knots with this handy knot guide. Knots. They're writing about knots.
• Make scanner-friendly "club" cards on your iPhone
• Google Squared formats your searches into spreadsheets