According to this page, you can export your iTunes podcast subscriptions to an OPML file. Send it over to your N8x0 and it should work with the new import from OPML file function. Alternative guides: here and here

For the sefgault: I don't have a clue, as I can't slide out a keyboard on my N800 to reproduce the crash. Does this happen anywhere in the program or just in some certain spot where you are supposed to type something? Does "gpodder --verbose --maemo" tell you anything important when run from osso-xterm and trying to reproduce the segfault?