With Smartfeed you can create your own personalized newsfeed from posts on this board and read them with the newsreader of your choice.
Smartfeed also supports a topic feed. You need to know the topic number to use this option and it can be used only for a single topic. The easiest way to get a feed URL for a particular topic is to view the page source when on the topic page of interest. You will find the URL in the markup in a <link> tag. It will look something like this: /app.php/smartfeed/feed?tf=123. Copy that link into your newsreader.