1. Too many boxes! They clutter up the page. What should I even look at?
e.g. http://www.burlingtonnews.net/burlington_ufo_center.html
http://www.arngren.net/
2. Websites with unnecessary moving parts -- they are a distraction and usually very ugly.
e.g. http://cavs.mit.edu/
http://anselme.homestead.com/AFPHAITI.html
3. Comic Sans, The worst, most pervasive font of them all. Just don't do it!
e.g. http://www.heavensgate.com/
http://www.boogersite.com/boogerSites.cfm?page=7