One the plugins I used to have in WordPress was to generate pages that only show posts from a certain category, almost as if they were sub-blogs. Doing this in Blogger isn't obvious but is doable once you combine a couple of things.
To access such a page you use the search feature of the site and you end up with an URL formed as [domain]/search/label/[label] to create the following.
Then add the url like so
Categorised RSS feeds.
The principle here is basically the same as above, create a URL and link to it however you so desire. The url is formed as follows
eg. http://www.thelastwilson.com/feeds/posts/default/-/XBMCNow you have that link its just a matter of putting it into an HTML widget with the appropriate tags, images etc and your good to go.