I'm sure this is common knowledge somewhere, but I discovered by accident that you don't need to type "http://localhost" or "http://127.0.0.1" to get your local Apache server in IE 5.2.1.
You can just type "http:///" and hit return.
[Editor's note: This doesn't work with Mozilla or OmniWeb.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020730092732658