Ways for one-way links.

1-Submit your sites to directories. Try to more focus on major directories like Yahoo & DMOZ.
2-Create website with unique,useful and interesting contents which will give free natural links.
3-Write interesting article and submit them to article publishing sites.
4-Join forums and participate in discussions. Place your URL & anchor text as the signature.Try this site to get forum links.
Get forum links
5-Do blog commenting and place your URL & anchor text. Try to focus on high PR blogs.
6-Give away free ebooks and white papers that contains your URL.
7-Create a blog for your site.
8-Social bookmark your site. Give an option to bookmark your pages.
9-Join and participate in social networking sites and post your URL.

One way link explained

One-way links are links to your site which in return do not receive link from your site.
One-way links gives a strong message to search engines that your site is valuable, so that other sites voluntary speak about your site.

One major advantage of one-way links are that they are easy to get. One-way links directly promote link popularity. Google consider link popularity as a vital factor to determine SERP.

Since there are lot of free ways to get one way links, you can target on relevant sites and get more referral traffic. Google webmaster guide discourages reciprocal links. So its always effective to get one-links as much as possible.