Version:           0.3.90 (using 4.4.00 (KDE 4.4.0), Mandriva Linux release 2010.1 (Cooker) for i586)
Compiler:          gcc
OS:                Linux (i686) release 2.6.33-desktop-0.rc7.1mnb

if you click on "installer dans itunes" here
http://sites.radiofrance.fr/chaines/france-culture/podcast/

then
you have a webpage error :
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Unknown error

When connecting to: itpc://radiofrance-podcast.net/podcast09/rss_10466.xml

Check the address for errors such as ww.kde.org instead of www.kde.org
If the address is correct, try to check the network connection.
If your computer or network is protected by a firewall or proxy, make sure that rekonq is permitted to access the network.
Of course, if rekonq does not work properly, you can always say it is a programmer error ;)
*******************************************************************************************
then
the podcast is not added to amarok