Last week we thought it would it be interesting to embed an AJAX poll in the body of a blog post, Selling Via Content: What’s Your Opinion of Dell Lounge?
We forgot that the majority of our readers follow this blog via RSS feeds or via email. Feedburner rendered the poll as a simple unordered HTML list, stripping the interactivity. We also used a smidge of CSS to hide the poll title auto-generated by Democracy. CSS doesn't reach the feed, so that minor tweak was also lost.
Neither change mattered in this case, but the marketing takeaway is clear: RSS is about content, not presentation. Keep the markup in your feeds simple. Avoid embedded code. Make it easy for your content to fly free.