It's very important to realize, though, that the FeedReader sample, the FeedReader Tutorial and, in fact, NetBeans IDE 5.0 itself, are all in a pre-Beta phase. Therefore, when using any of these, you will come across bugs of various kinds -- so don't be surprised when all kinds of weird things start happening. In particular, the code used in the FeedReader sample needs to be closely checked, so -- until that happens -- there's likely to be a lot of outright bugs as well as 'things that work but could be coded better'. Similarly, the tutorial suffers from this problem too.
If you decide that you don't like the FeedReader sample for some reason, you can treat it just as you would treat any other module you don't like... by uninstalling it from the cool new Module Manager (click to enlarge):