Sorry, no answers on free apps but Podtrapper is ported from Blackberry to Android now. I love it because of the control. That applies to sources of the netcasts, download options, play options. It has more menus and interface to learn than many but does the best job as far as sources of media, playing the files and managing how you get and store them.
The developer also deserves credit for his responsiveness to both of problems and adding features. I don't know about Android Market but he went above the call of duty to sort out Blackberry App World issues and he responded to and added product feature requests.
Well worth the $5 - 10.