Stretching your battery

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My phone is fast, can run multiple processes, do 3G, 4G, Wi-Fi, GPS and Bluetooth, and has a big bright display.

Of course, all those things suck down the battery.

Here are some thoughts on stretching your battery.

Charge

• Charge every night so you start the day with a full charge.
• Turn off GPS, Bluetooth, Wi-Fi and 4G (for Evo) when you're not using them.
• Have a car charger, and use it whenever you'll be in the car for a while and your phone is not fully charged.
• Keep your phone cool (avoid sun, warm car, etc.), heat reduces the current charge.
  
• Keep the screen brightness as low as is comfortable.
  

Battery Life

• Myth: "Fully discharge your battery to avoid 'battery memory'." This was advice for Ni-Cad batteries. Lithium-Ion batteries actually do better keeping close to a full charge (but fully discharge it about once a month to calibrate the batter level meter).
  
• Keep your phone cool. A hot phone both reduces the current charge and degrades battery life.

More info at: Tips to extend Android battery life and How to prolong Lithium based batteries.