I'm not familiar with how netvibes works, but if there's an RSS
interface, you might use the RSSReaderPlugin*.
Also take a look at this recent thread:
http://tinyurl.com/3bs4uv
(http://groups.google.com/group/TiddlyWiki/browse_thread/thread/619dcd34a5373bdb/)
HTH.
-- F.
Actually, you could use TiddlySnip:
http://tiddlysnip.com
-- F.