Website Health Checkup Standards Based Checkpoints.

Accessibility

Section 508 (15 guidelines covered by 34 checkpoints)
WCAG 1.0 Priority A (17 guidelines covered by 31 checkpoints)
WCAG 1.0 Priority AA (23 guidelines covered by 32 checkpoints)
WCAG 1.0 Priority AAA (10 guidelines covered by 11 checkpoints)
WCAG 2.0 (106 checkpoints covering A, AA and AAA guidelines)
Accessibility - more information

Legal Compliance

Spell Checking

Check English Spelling (US, UK and international spelling variants)
Custom dictionary for unusual words like product names
Uses page LANG attributes to choose spelling dictionary
Choice of default spelling language for pages without LANG attributes
Spell Checking - more information

Web Standards

Section 508 (15 guidelines covered by 34 checkpoints)
WCAG 1.0 Priority A (17 guidelines covered by 31 checkpoints)
WCAG 1.0 Priority AA (23 guidelines covered by 32 checkpoints)
WCAG 1.0 Priority AAA (10 guidelines covered by 11 checkpoints)
WCAG 2.0 (106 checkpoints covering A, AA and AAA guidelines)
Web Standards - more information

Browser Compatibility

META Content-Type charset doesn't match the charset actually used
Certain PNG and GIF images that don't display correctly in Internet Explorer (IE)
Non-standard image formats which only work in Internet Explorer
Standard HTML 4 tags not implemented in some browsers
Standard HTML 4 tags implemented incorrectly in some browsers
Flash based interactivity/navigation requiring extra clicks in IE
Pages that trigger quirks mode
Netscape specific JavaScript and HTML (document.layers, document.ids, etc )
Microsoft specific JavaScript and HTML (document.all, etc )
Attempts to modify XHTML pages via document.write and innerHTML
Browser Compatibility - more information

Broken Links & Errors

Broken links
Missing anchors
Unexpected HTTP error codes
Script errors
Pages with large ASP.NET viewstate
Invalid SSL certificates
Missing DNS entries
Malformed URLs
Badly configured RSS feeds
Placeholder text such as "Lorem Ipsum" and "TODO"
Domains close to expiring
Badly configured 404 handlers
Errors - more information

Search Optimization

Google search guidelines
Bing search guidelines
Yahoo search guidelines
SEO best practice guidelines
Check for your keywords in titles, headings and highlighted text
Search - more information

User Experience