If you turn off that keyword crap in netscape 4 then it will auto-add www and .com to anything that doesn't already have a TLD (like .com, .net, .edu, .org, etc) without the delay.

There's only 2 reasons I don't use NS 4 anymore: it doesn't render CSS properly (minor), and it locks up a lot (major). Now I use k-meleon
(kmeleon.sourceforge.net) mostly because I don't like IE or Mozilla. The fact that I contributed about half the code also slightly influences my choice