From Salon:
In November of 2007, Jeff Deck encountered a sign that would change his life. He had just returned from his five-year college reunion at Dartmouth College, embarrassed by his lack of accomplishment in life, when, walking near his apartment in Somerville, Mass., he encountered a sign that had already stopped him in his tracks multiple times: “Private Property: No Tresspassing.” The extra “s” in the sign had, as he puts it, long been “a needle of irritation” — but now something had changed: He felt the urgent need to correct it.
In the days that followed, Deck decided to give his life some purpose (at least for a few months) and, several months later, set off on a road trip around the United States in order to document our country's many misspellings. He gave himself the mandate of correcting at least one spelling mistake every single day. Together with a rotating cast of friends, he traveled from the Northeast (“bread puding”) to Georgia (“pregnacy test”) to Wisconsin (“Milwuake Furniture”) while documenting each mistake and each correction on his blog — a mission that taught him about the breadth of America's language problem and its citizens strongly divergent attitudes toward the English language.
More here.