How does google PR work?

[mrgica]

Who can explain to me how google PR works?
How can you improve your PR?

I know if you exchange links with sites who have nice PR you also get better PR. But how does the formula look like, how do they calculate that?

And what more can increase your PR?

Thanks in advance.

[dissipate]

http://www.rlrouse.com/google-pagerank.html

[mrgica]

http://www.rlrouse.com/google-pagerank.html

thanks mate, it seams its all about links...