Kent pointed me to the Gallery of ''Misused'' Quotation Marks which has the same purpose as this site, but more traffic and more examples. In spite of the competition, I shall continue to add to this site when the opportunity arises.
I don't usually post the following: newspaper headlines, personal email, craigslist postings, unprofessional websites. I also tend to not crosspost things from other blogs, since I have so much unique material waiting for me to get to it.
Things I see a lot: silica gel "do not eat"; hair dryer labels; inside the bus "do not drill"; Wal-mart sign about IDs; coffee machine with "2" cup sizes; employees must "wash hands".