The Italian poet and academic Giosué Carducci (1835-1907), winner of the 1906 Nobel Prize for Literature, lectured on Rudel. He also wrote his own treatment of the legend. If your Italian's up to it (sadly mine isn't), you can check out both on this site.
'Consalvo', a poem by another Italian, Giacomo Leopardi (1798-1837), is also believed to be inspired by the Rudel story. You can find 'Consalvo' in the original Italian over at wikisource.