It performs well and handles RSS 0.9 and RSS 0.91 as for as I can tell.
You can download it from http://jan.kneschke.de/html/modules.php?op=modload&name=Downloads&file=index&req=getit&lid=3
It is gzipped for faster download.
The original maintainer Patrick Kellum doesn't maintain the block as he said in a e-mail which means that someone else has to commit it to the CVS.
The code itself has been touch to survive error_reporting[E_ALL] and the generated HTML has been check to conform XHTML 1.0. Both topic aren't handled perfectly yet.