Does anybody know what does it take to publish a press release in popular/big magazines, news papers in US on large scale ..?

How much money to be spent?
Whome to approach ? of-course the publishers, but any good press release agencies, freelance reporters can help ?

What else do I need to know .. ?

I want to spread the word out for some of our applications
- BlueToad.com The digital format of your favorite magazines from around the world. .
- Freelance Project Updates

and many more

Any ideas, suggestions, feedback are welcome !

Thanks