How to avoid duplicate content in WordPress.
I assume that most people read this blog via my feed, not via my website. For those that do visit my website, I’ve just updated my non-permalink pages (tag pages, category pages, monthly archive pages, and home page) to include excerpts of the latest ten posts (per category, per month, or per whatever) rather than the full text of the latest two. I did this primarily for Search Engine Optimization (SEO) by avoiding problems with WordPress and duplicate content.
I use the Excerpt Editor plugin (by Andrew Ozz) to automatically generate excerpts for each post, and I use the Different Posts Per Page plugin (by MaxBlogPress) to specify ten posts per page. Each plugin has lots more options, but that’s the short story.