Podcasting

Have just looked at the podcasting inducation video "Podcasting in plain English". I have learned what POD in PODCASTING stands for: "personal on demand" (versus BROADCASTING).
I have created an RSS subfolder in Google Reader entitled "Podcasts", to tell the difference between other RSS feeds and Podcasts.

BBC podcasts

• Gardener's Question Time (radio program)
  [very easy to use, clear, beautiful]

University of Oxford

• music from Merton College Chapel (music only)
  [when fiddling around I started playing several podcasts simultaneously, which meant that the music got overlayed - very weird]

Podcast.com

• 2 American belly-dancers in Bangalore (Video story with soundtrack)

Podcast Alley

• I looked for a podcast on pottery, with video images. I found "Pottery Pod", a collection of practical hands-on podcasts by American potters. Some of the recording are a bit low-tech and I couldn't always understand the rambling voice track. Some videos were terribly slow to download and look at (by default with "QuickTime"). I wonder if one needs some special podcast downloading software? Some link on "Podcast Alley" calls it a "Podcast Aggregator".
  What is a "Podcast aggregator", I wonder?