I found this list of 19 things not to do when building a Web site.

The first, DO NOT resize the user's browser window, EVER resonated with me because I was reading a site last week that had some great information that I wanted to read, but every time I clicked on a link, my browser would blow up to full size. I finally gave up--it was just too annoying to go on.

I also liked number eight: If your website does not work in Firefox, welcome to 2007 DUMBASS. Even though on average, only 10% or so of users use Firefox, those users are influencers. Of course on some sites, the percentage is much higher. On Technometria, year to date, Firefox and IE users are dead even: 42.9% and 43.1% respectively.