Keywords play a very important role in building backlinks. You can use Google Adwords to check which keywords are more valuable and to give you ideas on how to improve on link building.

Choose the right places to submit links to. They should have high PR and high traffic.

Blog comment to relavant site is a good way to get backlinks. JUst make sure that it's a dofollow site.

If your contents are unique you might get relevant backlinks.. Concentrate on your content..

Following your competitor is the must effective way and secondly try to search the links related to you niche update your website on daily basis or twice in a week or atleast once in a week to be able to achieve the quality ranking

To get the most bang for your buck from your link-building efforts, avoid these bad link building ideas.
1. Not Working For Anchor Text Links.
2. Soliciting Reciprocal Links.
3. Not Scouting for NoFollow Tags.

Blog commenting, Commutative analysis, paid article submission helps you to get more and more backlinks.....

A good backlink tool will help you find related forums and related Websites. I’ve found getbacklinksforfree.info to be an excellent tool for find quality forums and related backlinks. The important thing about backlinks are that they must be relevant links.

These 3 techniques will help to increase backlinks.Determine who your competition is and perform a link, Manually visit the top 100 sites for your top 2 - 10 targeted terms and see which ones are directories, blogs or have link pages, Use special search operators such as intitle:Keyword Phrase "add link", inurl:directory intitle:keyword, intitle:keyword inurl:resources, etc.

The best way to build back links is to spend time visiting blogs and forums that are similar to your site and placing back links in your signature or name. Directories are also very easy to submit too. If you are looking for high PR sites, look for blogs to comment on as they tend to be the ones with high PR compared to directories and forums. And always make sure that the site is a do-follow, otherwise you are wasting your time.

some ideas are:
Acquiring lots of Quality links are definitely better of course.
anchor text variation is important because Google likes to see natural link building. If you use a variation of keyword anchor text, that would be of the best ways to do this.
One of the best link building strategies I use is to keep my main keyword but have other keyword anchor variations to complement it. I have learned from other SEO specialists the ideal mix of the number of primary keywords and secondary keywords in your page.
To get some basic understanding of internal linking within your pages, I suggest that you understand a little about orphan pages and how they are viewed by Google.
Do Not Ignore Outbound Links
Links Embedded in Page Content Have More Value
Link Also To Pages Not Just Your Homepage
Buying Manually Added Quality Backlinks