World business rapidly increases in this period as fast as technology expansion in information technology. It's surprised if there are little numbers of business companies which don't use internet and search engine as promotion and marketing media. While a lot of people around the world use search engine to find various informations. If it is looked from business glasses, it should be matching between business companies which promote their product and service on search engine and people find them on search engine, like a moor and a bolt, complemented each other. Now, this is an opportunity for business companies to increase their marketing on search engine.

Smart SEO is the best way for marketing and promotion media. What's smart SEO exactly? It's SEO technique implementation to business website which can be on good position in search engine result with smart and effective way. Of course it should use white SEO concept to implementation so that search engine will note the website safety.

These are some link building techniques for smart SEO of business marketing:

Build fun or helpful website widgets relevant to your business or industry, for examples mortgage calculators, body mass index calculators, etc. From this point, people will review your widgets include your link inside.

Providing testimonials for industry products you use

Post business articles into quality articles directory

Write about, and link to, companies with "in the news" pages. They link back to stories and blog posts which cover their developments. This is obviously easiest if you have a news section or blog. Do a Google search for - your industry + "in the news" -.

Perform surveys and studies that make people feel important. If you can make other people feel important they will help do your marketing for you for free.

Create your own topical directory about your field of interest. Obviously link to your own site, deeplinking to important content where possible. Of course, if you make it into a truly useful resource, it will attract links on its own.

Develop business relationships with non-competing businesses in the same field. Leverage these relationships online and off, by recommending each other via links and distributing each other's business cards.

Hold a contest. Contests make great link bait. A few-hundred-dollar prize can result in thousands of dollars worth of editorial quality links. Enough said.

Leverage new real world relationships into linking relationships. If you go to SEO related conferences, people like Tim Mayer, Matt Cutts, and Danny Sullivan are readily accessible. Similarly, in other industries, people who would normally seem inaccessible are exceptionally accessible at trade conferences. It is much easier to seem "real" in person. Once you create social relationships in person, it is easy to extend that onto the web.

If you create something that is of great quality make sure you ask a few friends to tag it for you. If your site gets on the front page of Digg or on the Del.icio.us popular list, hundreds more bloggers will see your site, and potentially link to it.

That's few points only. I compile them from SEO book and some SEO articles.