Amarok 2.2 is probably the only audio application on the market unable connect properly to the IPod. It is impossible to copy podcasts within Amarok to the IPod since Amarok 2.x. This functionality simply disappeared during the 1.x to 2.x version jump. You can download and listen to podcasts, you can connect your IPod, but you cannot drag the podcast to the IPod.
A few weeks ago you could help yourself if you know where Amarok stores the podcasts (
~/.kde/share/apps/amarok/podcasts): just navigate to this directory and drag the audio file to the IPod, but looks this rake was also disabled within the last versions, since Amarok now only segfaults if you dare to do this.