Grammar sticklers and especially wannabe grammar sticklers might enjoy the grammar girl podcast. I enjoy a light-hearted discussion of grammar, and occasionally learn things I didn't know before. Or feel vindicated for already knowing it. So I reccomend it.
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".