You should always have your keyword list at the forefront of your mind when writing articles, but even then it can be a challenge to come up with an interesting angle for your article.

Here are some ideas of things you can include in the body of your article.

Pros and cons of different alternatives.

History of the concept, or solutions to the concept.

Personal stories.

Links to other pages on your site (e.g. review pages or main sales pages).

Relevant news (with sources and dates).

Facts and figures, etc.

Finally, there are some things you might consider that can give your site an interactive feel (interactive = not "thin").

What about using “Tell-a-friend” script?

Why not experiment with your sites. Add a "tell a friend" form at the end of your articles so that if visitors find an article interesting, they can easily recommend it to their friends?

Don’t under-estimate word of mouth advertising.

How do you do this?

Search Google for:

free recommend site script

The top site here in Spain, and probably where you are searching from too, is Hot Scripts. On that page there are a variety of scripts, lots of them free, to allow you to add a tell-a-friend function to your pages.

The more useful your articles are, the more value you can expect when using tell-a-friend scripts.

Another great idea is to add a forum. Adding a forum is very easy, and does not have to cost anything. I use a free script called Ikon Board to support my own software.

Also look for Poll Scripts so that you can run polls on your site.

Don’t forget a newsletter can keep visitors coming back, or why not just create a miniseries using an autoresponder (I use Aweber for both my newsletter and autoresponder mini-courses. All the tools in one place - a very powerful tool.