One Way Links

Reciprocal links aren't as important as they used to be. They should not be
your major traffic-generating strategy. They are still very useful, especially
when you're getting a new site established in the search engines.

Here's an article I wrote describing in detail how to get reciprocal links.

Stephen Mahaney offers a wealth of information in this article:
12 Essential Strategies for Building & Structuring Inbound Links

(Thus articles are excellent examples of experts getting articles
published on other people's sites.)

Also, here's one of the many warnings from Google:
"Keep in mind that our algorithms can distinguish natural links from
unnatural links. Natural links are links to your site that develop as part
of the dynamic nature of the web when other sites find your content
valuable and think it would be helpful for their visitors. Unnatural links
are links to your site placed there specifically to make your site look
more popular to search engines."
Source: http://sitemaps.blogspot.com/

Google's webmaster guidelines say plainly:
"Don't participate in link schemes designed to increase your site's
ranking or PageRank."