Yale Style Manual   Discusses both design and navigation issues.  For example, how to use links as navigational aids:
http://www.med.yale.edu/caim/manual/contents.html

 

WebMonkey/Design  http://www.hotwired.com/webmonkey/design/

Web Pages That Suck  http://www.webpagesthatsuck.com/
This site was started as a sort of prank a few years ago.  And then got serious.  Their analysis of bad design features influenced how people began to evaluate Web page design.
 
 
 
 
 

HTML Bad Syle Page  http://www.earth.com/bad-style/  [fairly detailed about HTML coding]

Worst Web Pages of Congress  http://www.efn.org/~dmorgan/worst.html
 
Frames
The International I Hate Frames Club  http://www.wwwvoice.com/hatefrm.html  [recently defunct]
When frames first arrived, it seemed that everyone had to try them out.  Some Web pages ended up with some many divisions to them that you couldn't figure out how to use them.
Why You Shouldn't Use Frames http://www.ifi.uio.no/~jonhaug/say-no-to-frames.html
What's Wrong with Frames?  http://www.htmlhelp.com/design/frames/whatswrong.html

Accessibility Issues
WAI Accessibility Guidelines:  Page Authoring  http://www.w3.org/TR/WD-WAI-PAGEAUTH.html
Accessibility is a *huge* issue.  Many institutions require that their Web pages be accessible to both graphic and text-only access.  The most popular text-only browser is lynx.  By adding an alternative title to an image in Composer, you are providing a text alternative for those who use a non-graphics browser.
How Different Browers Look at Your Web Page http://www.cast.org/bobby/
 

HTML and Site Validators
These sites will (for free) examine your published page and send you comments/corrections:
Doctor HTML  http://www2.imagiware.com/RxHTML/htdocs/single.html
NetMechanic  http://netmechanic.com/
Web Site Garage http://www.websitegarage.com/
 

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