Hi Anita
Let's break down your questions 1 at a time here.



>     What are podcasts? Are they accessible with screen readers?


Podcasts are audio programs which can be automatically downloaded using a 
piece of software that does the job for you so you don't have to keep going 
back to the website every time a new show comes out.
Screenreaders are not a factor in this case.  If you have a modern version 
of the 3 most popular screenreaders in use, the iPodder software works fine 
and will do this for you.
Note for iPodder to work you must have Windows xp, or 2000. there are other 
programs out there that will automatically download podcasts which will 
work on other operating systems.  All a podcast really is is a regular mp3 
file. nothing special about it. The term podcast really isn't all that good 
because it just creates more questions than answer them. But the term has 
stuck so here we are.








>What is RSS?
RSS is part of the technology that makes podcasts possible, but it's not 
the whole thing that brings a podcast to you.  Basically it's a way to 
subscribe to a particular website and get that material sent to you 
whenever it's updated.  These websites and podcasts are almost always free, 
however there are a few out there that charge. the website will tell you if 
there is a charge associated. but  when it comes to podcasts, 99% of the 
material is freely available.






>  Can one listen to podcasts while they're being aired, or only after 
> they're downloaded?


You can only listen to a podcast after it's been downloaded.  Like I said 
above, these are just mp3 files, and you can listen to them using Winamp or 
any other mp3 player software. and you can transfer them to a portable mp3 
player if you have one.



>  What are some web sites of podcasts users on this list have found easy 
> to navigate?
>

Well, my personal favorite is

http://www.podcastpickle.com, this is a podcast directory. It lists shows 
by genre, group, and best of all, they are sorted by a rating.  So if you 
only want family friendly podcasts, you can find those.  Any screenreader 
with good web accessibility web features will handle this site just fine.


Also go to
http://www.ipodder.org
this is the website for the iPodder software mentioned above. it also has a 
directory of poddcasts.

  hope this helps.



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