Website accessability (for physically handicapped folk) has been an occastionally hot topic in the last 10 years or so. There was a hullabloo a while back when it was asked if it should be law that all websites be capable of being read by screen readers.
I recently found a nice website validator called “the Cynthia Says™ Portal“. It looks at a pretty wide range of things, allows you to emulate a HUGE range of browsers, including MSIE 4 for Solaris.
I haven’t done much of what they suggest, since it would be a big job at this point, but I’ll probably do a bunch of it in the future.