For some of the Podcasts, you can click the right-pointing arrow next to the Podcast's name (when selected) and that will take you too that podcast's iTunes page. This works for the Engadget podcast.
However, for the others, it will open up a page relating to the podcast in your default web browser. Is is what happens for the Stack Overflow podcast"
You should be able to drag links from iTunes into a text editor, to get a link to the page. Try searching for the podcast, then dragging the link from iTunes to a text editor or other program.
