Getting link from other website is one way to increase your Pagerank, because your Pagerank is calculated by other website Pagerank which links to you. Many Webmasters do not want PR0 sites linking to them. Do you agree on this? Well, I disagree with this, especially if you have PR 0. One day, those PR0 sites could have higher Pagerank, maybe the next PR4 or better. If you have PR 0, there is nothing wrong to get links from other PR 0 too. Just remember to avoid spam or adult website, because google hate them