For this stuff to work, you need the alternative firmware WDLXTV for your WD TV Live Box. You can get that from the WDLXV site.

Simply get the file and copy it to /conf/ directory on your WD TV Live wdlxtv pimp'ed box:

 scp dailypodcasts.xml root@ip_of_your_wdtv:/conf/ 

(if you have trouble downloading the file, e.g. get displayed XML code, use "Save As..." function of your browser)