One very effective link building trick is to simply comment on blogs that are in your niche
. The search engines such as Google give the most credit for one way backlinks, so this is what you should concentrate on. You can use Google's blog search to find relevant blogs and then simply post helpful comments on them.
Don't forget to put in your link when you post to a blog. You should only do this in an ethical manner, not by leaving spammy comments all over the place. As long as you write something that contributes to the blog, you won't have any problems. When you do it this way, you not only get backlinks but you can network with other bloggers in your niche, which can be very helpful.
Another worthy way of building high quality backlinks is to use Squidoo and HubPages, which are services that allow you to create your own dedicated page for any topic you want. Creating your own website is a breeze with these services. The main advantage you have with such services is that you choose the links you want to add. You can change links as often as you want with little effort.
Maintaining these pages is simplistic in nature but you can do it whenever you choose. The links you have chosen can now be changed at will. With very little effort you can manipulate the links you've chosen. This is a good, free way to create backlinks for your site that are actually counted by Google and the other search engines.
Another effective way to build high quality backlinks is through forum signatures. There are an abudance of forums you can use that offer you the opportunity to signature your link in posts. When your backlinks come from sites like these your ranking will increase. The idea that posting to forums is too difficult to be worth the effort is obsolete. Ensure that you are posting only to relevant forums to avoid negative rankings.
So backlink building may seem like a lot of work, but it's definitely worth the effort.