By looking at my blog http://www.healthyhumanbeing.ca you'll see that I only have the first two paragraphs of each post as a summary on the front page. For key word density, would it make more sense to just show entire posts on my front page instead of snippets, to help the on page key word targetting for my site? Thanks.
Personally, I think it best just to stay with the 1-2 paragraphs. That way you have room to list more posts. I don't think people hit the back button to go to previous pages unless they are really into your site. Sorry if this was not much help.