Here I will jot down some link building tips for getting high Google PR

1. Avoid massive and low-level directory submissions.
2. Try getting some site-wide links from a huge site with 150,000+ pages (generally a large forum will do).
3. Try building links from old and highly trusted domains.
4. Get a few deep links from relevant articles or content.
5. Avoid link exchanges, especially from new domains.
6. Beware of "nofollow" tag which can be a link attributes or meta or robots.txt file. Those links hardly counts towards your voting wrt PR.
7. Beware of JavaScript redirect links, JavaScript are not crawled by spiders.