showrss plugin is listing your interesting rss.
@@showrss(http://rss.slashdot.org/Slashdot/slashdot)@@ is
2010-03-21
2010-03-20
2010-01-24
2007-09-18
2007-08-30
2007-07-06
2007-06-19
2007-04-09
2007-04-04