* Obtain links from a variety of relevant sources
Agree, links from relevant topic is important and be sure the linking site is of good quality. deep linking is better than focusing all on the homepage.
* Avoid mass link exchanges, paid link advertising on non-relevant websites and other such techniques
Agree, go for quality instead of quantity
* Use relevant anchor text whenever possible
Agree, target for three or two key phrase, focus on one phrase at a time.
* Don't get stuck on a sites PageRank - Relevancy out-rates PageRank any day
PageRank may not be showing the current status but high quality sites generally still have good
PR, double check the site structure, content and linking scheme to determine if the site is of quality site.
* Links from authority TLD's such as .edu, .gov are weighted very heavily - pursue them when relevant
.edu .gov are generally of quality information sites and with lots of inbound links, thus a link from such site helps.
* Links from authorative sites are weighted very heavily - older sites, high rankng sites, etc
Agree, again, quality out rank quantity