An RDF feed listing the last 10 non-minor updates to Wikipedia is available at http://www.wikipedia.org/tools/feed-en.rdf (replace 'en' as desired to get a feed for the other languages). Updated every half hour, so it may miss things at busier times. ;)
Thanks to the magic of RDF, Kuro5hin.org users can now select a Wikipedia headlines box in their display preferences.
Users of Ximian Evolution for e-mail can also put the feed into their 'Summary' page via Tools/Summary settings/News Feeds/Add news feed.
Suggestions for improvements and other uses are welcome at http://meta.wikipedia.org/wiki/RDF_spool
-- brion vibber (brion @ pobox.com)