Are you looking to blast an entire email list of, let's say, tech writers with a pitch? Or are you looking to get on a particular website like GeekWire or TechCrunch?
Look up associations related to your targeted niche, you'll find all sorts of writers who are interested.
Your question is rather vague, and -- if not handled correctly -- can lead to a real bad experience for the journalist, and, in turn, your chances of getting any coverage.
I'd be happy to talk with your more about approaching these people strategically for the best possible results.
All the best,