Which one is the best in your knowledge under KDE/Qt?
Amarok should do it nicely
I tested Amarok 2.1.1 in openSUSE 11.2 and I saw that this
version does not have the “Devices” tab and apparently cannot synchronize with an MP3 player, as the old 1.4, which I am currently using, can. So, I suggest the previous version of Amarok, which is part of the KDE 3.5 family, if you want to transfer the podcasts to a player.