Duplicate content becomes a big issue when it comes to blogging, and it can significantly effect your ranking in Search Engines. While that is said, I am going to be pointing out some key things I notice that you can do as well on your blogs to avoid duplicate content. Not only these will help you avoid duplicate content, but it will also help you increase ranking of your inner pages in search engine as well as give you a chance of getting higher pagerank.
First thing you need to do is get rid of those archives pages. Yes i know it comes in with the default template, but it can be turned off, and I seriously recommend it to be turned off because half of your real users won't even bother using the archives if you have a prominent search button on your website. Why should they digg through your archives when they can just type a keyword and get the results through the search feature. It has no benefit what so ever as for SEO Perspective, but it does have some disadvantages and one thing is that it will create additional pages with duplicate content. Your indexed page count might increase in Google and other search engines, but when those additional pages are duplicate content, then it becomes a bit conflicting.
Next you can eliminate the factor of duplicate content by displaying posts in more then one category. While it is ok to do it sometimes if it is absolutely necessary, but try to find the most accurate category for the post. For example I could've put this post in both SEO and For Starters as this is something that starters can use, but so can the current bloggers and it is seo related so I decided that it should belong in SEO Category not both.
However, like my Expansion Template Post which was both for phpLD and Wordpress therefore I couldn't just post it in WP Themes section, but if I just post it in the Freebies then my wp themes collection would be separated therefore I had no choice but to put it in the categories. Those are some choice that as a blogger you would have to make.
Third way to avoid duplicate content is using excerpts. When writing a wordpress post there is an option below the Upload section which says Optional Excerpt if you write something in that section that will be the content that wordpress will show on the homepage and the original post will be shown on the category page. Not only will it help avoiding duplicate content, but it will allow your category pages to rank higher as well in search engines as they have some keywords which your main page does not. That will help your ranking as well as increase your possibilities of getting a higher page rank.
By using this these three methods you can definitely avoid duplicate content on your blog and have higher rankings then your competitor. Get that edge now by applying these three strategies on your blog.
SEO Crunch went into some technical ways of showing how to use an excerpt.
Syed Balkhi
CEO of Balkhis Inc.
http://www.balkhis.com
admin@balkhis.com