This is what I do also. I figure that if people are using Netscape 2.0, they're seeing problems on other sites as well. I generally design for IE 5.x, NS 4.x, and NS 6.01. They've been out long enough that even the least web-savy person should have one of those. I also think that most HTML that works wih NS 4.x (as much as it complains) probably also works with IE 4.x.
Originally posted by boredboi
but just to play safe, i'd stick to making my sites compatible with browsers of version 1 less than the latest browser..