How To Get Free Backlink

Backlink is a tool to get google pagerank, because the quality backlinks that is believed to determine the ranking of a site on the SERP (Search Engine Result Page). But, you also need to remember that not all backlinks are useful for your site, there is also a backlink that could "hurt" your site. Backlink bad usually comes from spam sites, sites search spam and other automated sites.
Exchange Links
Automatic Method There are several sites that offer services becklink automatically exchanged between members. One absolute requirement to be able to use this facility is the site you have PHP or ASP based. Sites that offer this facility include Digitalpoint Co-Op and RecieveLinks. You will be given a few lines of script PHP / ASP that will display a link from your partner. You will be awarded points every time a user displays your link partners. The more points you get, it will be the more backlinks you will get.
Buy Backlinks
How To Manual This method may be a bit more troublesome than the automated way. This method is usually used for HTML-based sites. But the advantages of this method is we can select and decide which sites are able to exchange links with our website, so only sites that have the same topic and quality are linked to our site. You do this by contacting the site owners that we are targeting. You can find the target site by googling or through community forums such as DigitalPoint, Adsense-ID, resep.web.id, etc..
Creating Dummy Site
One page websiteThis method is probably the easiest way to create a dummy site that used to get backlinks. We made only one article only, but the articles we have really good quality in order to create a quality backlink as well. You can create dummy sites such as Google Pages, Squidoo or Geocities.
Small Site  

Usually used as a small site is a free hosting network or blog for free such as Blogger, WordPress, the blog of Friendster or Myspace, blogher or any other free blog services. Small site update site does not demand too often provided the topic that we created is still in touch with our main site.
Other 

Profile Page You can insert a backlink on your profile page. Usually if we register on a forum or community service together, you will be given a profile page that can save your website link. Example: Mybloglog, Forum Digitalpoint, etc..
Signature Signature is a few lines given by forum or email that is useful to reflect briefly who you are. You can use this facility to insert a link your site. Give an interesting phrase in your signature link, so it can attract people to click on that link.
Social Bookmarking Although the results are not too visible, but the way it is still believed to generate traffic and backlinks of course. You can consider a wide range of social bookmarking that you think is suitable for your site. Social Bookmarking is Bagis including Digg, Del.icio.us, Stumbleupon, LikeCount.Com, etc..
Comment Some blogs (especially wordpress based blog) deliberately gives special recognition to the commentators, by removing the nofollow attribute (which is the default wordpress) on his blog comment system. Thus, these blogs can be used as a source of free backlinks with just a comment into the blog (do not spam of course).
Indeed, many ways to get backlinks untu, for Yahoo and MSN, a reputation link is probably not very influential (yet), but for Google, a reputation link is very influential. So if you want to have a link for the long term and have a great influence, it helps you pay attention to the factors that affect the reputation of a link.