I was working on a RSS driven newsletter for a client that need to have a web page displaying all the posts from a custom post type using the WordPress RSS feed.
First I needed to get the correct feed URL. The feed URL for custom post types can be located using a query string in the URL:
Replacing the your-wordpress-site.com with the url of the site you will be getting the feed from. And change yourcustomposttype with the name of your custom post type.
We can then use PHP to load the feed in to an array and loop through each elements tag name and pull the values we need and echo them to the page:
Big thanks to this question on stack over flow and several of the answers http://stackoverflow.com/questions/3346628/retrieving-rss-feed-with-tag-contentencoded