If you have a traditional website, you can still create an RSS feed for it. The feed file is incredibly simple -- see this site: http://searchenginewatch.com/showPage.html?page=2175271
Basically the RSS files consists of just a few tags: title, description, and link. Each of these three tags is nested in an item tag. All the items collectively are nested in a channel tag. And then there are some generic statements at the top, and a closing rss tag at the bottom. Here are some other resources in creating an RSS file:
Create your feed by filling in a form: http://www.webdevtips.co.uk/webdevtips/codegen/rss.shtml
Validate your feed: http://feedvalidator.org
XML doesn't allow any errors, so if you messed up one tag, the entire feed doesn't show. That's why it's important to validate the feed.
Feeddigest.com also allows you to combine different feeds, but only up to 5. After that, it's a paid model. However, the aggregated feeds are stylish and integrate easily into your site.
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