How blog is beneficial for SEO ?.

[webprof]

Use the anchor text you actually want
Give people something that they can naturally link to
Encourage people to “socialize” your work
Increase website traffic & build a following
Play nice with Google’s Freshness Update

[chandanthaver]

Hi friednd,

Blog is more beneficial for seo. Create a blog for your site and product and update regularly. We get traffic to there.
Do some Do-follow blog commenting like digg, reddit. We get back link's to there. So blog is most important off page activity.

[geetika rana]

Blog is beneficial for SEO for getting traffic to your website if you update your blog with unique and powerful content. Content is the king these days in SEO. Write interesting content about a topic related to your website and share it with people on blogger.

[kumar29]

Blogging and SEO intersect on two factors that search engines deem highly important:  content and freshness.    Put simply, if you update your blog regularly with unique content, you are essentially doing SEO.
1). Perform keyword research so you know what people are interested in or searching for within your topic area.
2). Focus on unique content only.  Content with a voice or personality instead of content that reads as if it were copied and pasted from some other source.
3). Link within your blog to other posts.  Google appreciates a site that links within to relevant content created previously.
4). Avoid large images in your posts.  Posting images is a great idea but make sure you size these down so they don’t reduce page load time.  Google likes fast pages.

[Johnny]

http://www.sproutcontent.com/blog/bid/106416/19-Reasons-Why-Your-Business-Should-Be-Writing-a-Blog <- Here's a post that I also give to my clients when they ask the same question.