First, your project needs to solve a problem for an identifiable group of people. Then, you build a relationship with the people that group of people trusts (e.g. by blogging, commenting on their blogs, etc). Then, you introduce your thing as something which will help their readers/colleagues/etc solve your problem.

That is the general gist of it. Your bigger problem: what identifiable group of people has a hole in their life shaped just like a news aggregator/mashup machine?

Edited to add: It is almost never, ever, eeeeeeeeeeeeeeever in your interest to allow yourself to appear poor and desperate, much less to make a point about it. "We are in desperate need of PR person (who can work for free :) )" is the first thing I see on your home page. That tells me you're poor, desperate, and unprofessional. "Indiameme is seeking forward-thinking PR professionals" is a much, much better way to phrase it.

(Forward-thinking, in this case, means willing to work for an unconventional arrangement in which they do your PR and you help them surface their stories. Word to the wise: no sane PR flack will go for this. However, having the offer on your front page won't hurt you.