examples of sites with good accessibility

Hello,
I am wondering what are some good examples of sites that have good 
accessibility.  I understand that users' needs would be different from 
site to site, and their reasons for going to a particular site, but I 
would still like to see who's doing what right.  Also, if anyone knows of 
a retail/e-commerce site that is doing well with accessibility, I would 
really be interested in seeing those sites.

As you can see from my previous posts, I am new to this area.  Thank you 
for your help.

I noticed that Amazon has a separate site (www.amazon.com/access).  There 
was an article about it, and that's how I found it.  I'm not saying it's a 
shining example of design, but it's a strategy and an example  (this 
version of the site also works for non-standard browsers like PDAs and 
such). 

Any other examples would be really helpful.

Anna Yevsiyevich
Web Usability Analyst

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