The content is just posts. What you could do is create a category called Blog or whatever your client is needing in the slideshow. And then on your home page (which I strongly suggest should be index.php if your using WordPress as a CMS) add this code:
<?php $blog_query = new WP_Query('category_name=blog&posts_per_page=3');
while ($blog_query->have_posts()) : $blog_query->the_post();?>
<li <?php post_class() ?> id="post-<?php the_ID(); ?>">
<h2><span><?php the_time('d/m/Y'); ?></span> <strong class="<?php //EIP_title(); ?>"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></strong></a></h2>
<?php the_excerpt() ?>
<?php endwhile; ?>
Now what this does is create a nice clean loop that will spit out 3 posts from your category Blog. It should be fairly simple to edit to your needs. I've wrapped it inside a list item, so you should be able to use this inside a nice jQuery slideshow.