Now-a days, most websites are in the trend of creating blogs in their sites.The main aim is to drive traffic to the sites and also to improve the rankings of the keyword. But does search engines approve of these internal linking or is it considered as spam?Also,does the search engines provide enough weightage to these links?

Well, following are some factors to be considered while creating blogs in your sites and posting the content :

• Ensure that the content of the blog is relevant to your site:
  i.e if your site is related to mobile phones,create a blog with content relevant to the same.There is no point in creating the blog with content related to TV.
• For each content posting,highlight the keywords for your content.
• Provide links to the other pages of your site whenever relevant
• Do not provide too many internal links for each content. A maximum of 5 links for an article of 500 words would be fine.
• The most important facet is to have fresh and interesting content that is attention-
  grabbing for the readers.

Here is a latest and interesting related query posted in one of the best seo forums
forums.seochat.com/google-optimization-7/internal-link-influence-a-no-no-260604.html.
The comment posted by djstreet is quite an educational one.