The first Lifehacker post hit the tubes four years ago today. Since then, we've published thousands of tips, tricks, guides, and tools to streamline your life. Here's a brief history of Lifehacker, 2005 to 2009. Below, we've taken a look back at all of our posts from 2005 to present and pulled out the five most popular posts of each year. Not all of them remain entirely relevant today, but they pr