Part of the art of blogging for SEO purposes is giving link juice to your previous posts. One way of doing this, which also works when you are short of blog topics, is to summarise some of your previous posts.
If you have been blogging for a while, you will have amassed a whole selection of posts on different subjects, which will be grouped around your interests. The summary post pulls together the posts you have done on one subject, and talks about each one, linking to each.
This technique not only gives you a good post, it brings together all your similar posts in one place. You might find these posts useful yourself when you are looking back at what you have written about a subject. In a multiple author blog, like this one, you can also pull together the different writings and viewpoints of your fellow blog authors. This is a summary post that I wrote late last year about our blogging about blogs. I also wrote another one grouping all the blogs that I wrote about getting results in MSN/Live Search.
These new links to old blogs add extra value and new links to old posts, which help them appear in the search results, and combat the effects of Google Gravity (or the results of the historical data patent if you prefer that term).
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