1. Viewing your site correctly
In our little web design community, most of the sites are frequented by either: other fellow web designers, or just other people in general. But I bet they aren't old, business men working for commercial purposes. Know your audience, and keep them in mind when you write. If you have a super computer and a super fast internet, not everyone does. Make sure everyone (or almost everyone) can visit your website at ease. Not everyone uses the same browser you do, try testing your site in different browsers.
-Test your site in various, popular browsers such as Firefox, IE, Netscape and Opera.
-Test your site in various screen resolutions. You can do that by right clicking on your desktop > properties > settings.
Not many people use the old 600x400 (I forgot what it was, 640x480? Ehh.) anymore. But you should still make your site easily viewable by 800x600 users, so make your designs/layouts, at least, smaller than 800x600. Most of the time, I make my layout headers 600x400 or so. Make sure your headers don't require them to scroll horizontally or vertically to view the content. I know 600x400 is too big on 600x400 (?) users, but almost no one has those resolutions anymore.
2. Site addresses
One of my first sites had a very long name that not everyone can remember easily. Also, long addresses are ugly. Shorten your addresses if it's too long, and make it easy to remember. Your address should be somewhat related to your website.
