Stop right there.
Friends should be friends - not business partners - in almost every case. Think three years down the road when you have put in more sweat and tears and more emotional and/or monetary investment in this company than the other two guys. One sort of helps, the other just bums along for the free ride. By that time, you've put in so much you *don't* want to have the company fail, and it just becomes a sick cycle - the more you put in, the more the company becomes 'yours' and the more you start becoming entitled to the good that comes out of it - and the more you start to despise the other two for not holding their fair share.
Or, maybe you all work equally as hard, but one of you doesn't think another is doing his fair share of the work.
Keep friends as friends. The second one little grudge gets in there because of work, it will go downhill fast. Additionally, having three people, all just as entitled as the next guy, all owning the same amount of the business, is a recipe for disaster.
I won't do so much as rent out a dedicated server with a friend. Why? Because we'll disagree on how something should be done and it will just cause unecessary tension.
Now, if you've worked (and I mean worked - not toyed around with ideas, but actually worked hard for a living) with these other two guys and you know they both are good individuals and won't carry an attitude or slack off, then it might be ok.
Sorry to be such a pessimist, but many good businesses have gone down for this reason.
[Edited 2010-12-06 06:57:04]
The above post is my opinion. Don't like it? Don't read it.