If you've ever watched The Tonight Show with Jay Leno you know one of his regular segments every Monday night is “Headlines”.  The segment sure is funny, but who wants to be a punch line on late night TV? Every day, we see ads and marketing materials with spelling, grammatical and punctuation errors. While these can be quite humorous, well-written marketing materials can support your professional reputation. Invest in an AP Style Guide and refer to it often. And always ask someone unfamiliar with your project to proofread. A fresh set of eyes is less likely to gloss over obvious mistakes.   Just a tip.