What you need is a (server-side) script that will turn your latest articles (from your database) into an (RSS feed) XML file. The resulting file can then be added to a feedreader, which checks regularly if there are updates to this file.
How did you make your site ? Did you use a CMS, or maybe made your own ? Are you using PHP on the server, or ASP.Net ?
pritaeas
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If you look at the footer here: http://www.onderwaterwereld.org/ you'll see that it is just an image with a link to the xml file.
Most browser will let you subscribe to them, which means they check for updates by downloading that file again. Same for Outlook, Google Reader, etc.
pritaeas
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Compare your xml file to mine. Perhaps there is missing some information in it. If you right-click the rss icon, you can save the rss.xml file.
Btw, your xml feed opens nicely in my browser (Opera), so it appears correct. I am not sure if you have a google account. If you do, then you can add your feed to the iGoogle page, or to Google Reader.
pritaeas
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One thing I forgot to mention than can be of use, is the rss link tag in the html's head. You can see it on the same page. It notifies the browser that there is an rss feed available.
pritaeas
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