Why shouldn't you include a letterhead on your press release? One of the biggest enemies of success in publicity is creativity. People try to get creative and they go right down the tubes. Follow formulas that have been proven to work. In the upper left-hand corner of your press release, you're only going to write one of two things. You only have two options. It's very simple to tell which one you use. The first option is the exact words, "For Immediate Release." Some of you may have seen that, and some of you may use it. Maybe you don't know really know what it's doing, though. When you put the words "For Immediate Release" in the upper left-hand corner, it does two things. It says to the reporter, "You can use this information any time you want. You can use it today, tomorrow, next week, next month, next year-anytime you want is fine with me." More importantly, though, it's saying, "Stick with me. I know how to play the game. I know that `For Immediate Release' should go in the upper left-hand corner, and I know when to use it."

The only other option that you have for the upper left-hand corner is what I called a "time qualifier." And write that down, because you're not going to hear it anywhere else. It's called a "time qualifier." It tells the reporter exactly when to use the press release, and when not use the press release. For more fantastic tips on how to write great press releases, read "How To Write Killer Press Releases."
http://101publicrelations.com/killer.html?utm_source=prideas&utm_content=killer_press_releases