14/01/2015
Make it clean, crisp, and applicable to your audience. Odds are whoever you sent your press release to has a dozen just like it in his/her inbox just waiting to be ignored. If you want yours to be chosen, it's got to be good. Not only does it have to be good, but it has to be as close to "ready for press" as possible.
When an editor looks at your piece, he/she is thinking, from the first second, about how long it's going to take them to get it to print. If your work is full of errors, lacking content, or just needs to be revived, they're not going to waste their time. So make sure you have good grammar, all the basics, and have something to write about.
Why should these people care what you have to say? If you're sending it to the right audience, it'll be obvious. If you're not, well, why are you wasting your time? Give the right people a piece of news (news, not advertising) and you're on the right track.
They'll care more if you send it in the morning. That gives them time to pad your piece into what they're already working on. Be considerate.