Do what you can to accomodate anyone that found their way to your site. I was told by some people a while back that BNB looked weird on the Mac. Here is a little trick for create background images that remain fixed while your page's text scrolls over them. Personally I get a bit dizzy from it, but it is a nice effect. Netscape will ignore this directive and display the page normally.
Nothing makes a webmaster crazier faster than knowing that their site is down.
I have a page containing some of the more common problems that occur and how to deal with them. For the PC, a great freeware program is available. Telnet is an Internet Protocol that allows your computer to act like a terminal to connect to a server that supports the service. Once you log in, it is very much like you are the console. Typically telnet is found mainly on Unix servers, but telnet access is a service that can also be added to NT boxes.