Are you looking to allow your readers to subscribe to a single category of your Word-press BLOG or only posts relating to certain categories, if so this tutorial may be able to help.
1. Update Permalink Structure
The first step is to update the Permalink structure of your Word-press BLOG by using this Permalink Structure tutorial.
2. Work out Category feed address
Assuming you have setup categories and are attaching all your posts to one or more categories we can work out the category feed for a specific category. If you have not setup categories and have not linked your posts to a category I suggest you do that now by logging in as admin and editing your posts. Whilst in the word-press post editor you will notice a categories field on the right hand side start ticking the categories that the post relates too. If a suitable category does not exist then simple add a new one.
With your categories setup and posts linked to suitable categories we can now work out the category feed address for a specific category by viewing your blog and clicking on a category. This should display all the posts for that category. Notice the page title in the address bar it should look something like this http://blog.mcdermotts.org.uk/category/windows-2003/to create a category feed for that category you simply append /feed/ at the end so it now looks like http://blog.mcdermotts.org.uk/category/windows-2003/feed/ and hey presto that is the feed address for readers to subscribe to only that category.
Your readers can now add that address into any RSS reader and automatically receive new posts from that specified category. See it in action on McDermotts
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