This is an increasingly big issue and US and EU laws man that mainstream sites must comply with general accessibility principles. See the resources below for tips:
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Relevant threads:
Section 508
Website Accessibility
Accessibility for everybody
Web Accessibility, or what the blind can see
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Relevant links:
GN Accessibility Links
Dive Into Accessibility
Articles on accessibility at A List Apart
About.com's Accessible Web Design section
tunna resources - information by a disabled webmaster for other disabled webmasters (and people designing for disabled users).
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Relevant FAQs:
Should I use XHTML?
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+Relevant TOOLs:
-______________________
-Emperor
+Web Developer Toolbar is an extension for Mozilla browsers with various developer tools including validation against several standards.
- (Added by: Emperor on Thu 06-Mar-2003)
+Web Accessibility Toolbar is the equivalent of the previous extension, but for IE.
- (Edited by: Emperor on Thu 06-Mar-2003)
+______________________
- (Edited by: Perfect Thunder on Thu 06-Mar-2003)
+Emperor
+ (Added by: Emperor on Thu 06-Mar-2003)
- (Edited by: HZR on Thu 06-Mar-2003)
+ (Edited by: Emperor on Thu 06-Mar-2003)
- (Edited by: Emperor on Mon 17-Mar-2003)
+
+ (Edited by: Perfect Thunder on Thu 06-Mar-2003)
+
+ (Edited by: HZR on Thu 06-Mar-2003)
+
+ (Edited by: Emperor on Mon 17-Mar-2003)
+(Edited by poi on 08-21-2004 11:25)