RSSMii

Get RSS updates on your Wii.
RSSMii How to Install

RSSMii allows you to get updates from RSS feeds straight to your Wii. You will get the updates on your Wii Message Board. It reads a "feeds.xml" file on your SD Card root to subscribe you to each feed listed. So you can update it at any time, then launch RSSMii again and it'll update your subscriptions.