Keeping your data backed up
Backing up data is like flossing - we know we should, we just don’t get around to it as much as we’d like. Nobody will admit it, though 
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Here are the rules of backup club:
- Make it automatic
- Make it easy
Gmail contacts flaw: Overview and suggestions
Crowd Favorites
Math & Numbers
- Mental math shortcuts, adding 1-100
- Understanding exponents and the natural log
- Div, Curl, Flux, Gradient and other Vector Calculus topics
Programming & Web Development
- Site speedups with HTTP caching, gzip compression
- Understanding Rails, Web debugging, and Javascrtipt
- Swap bytes with XOR, byte order, unicode
