If you simply type "browserwars" in the Location field, the browser will punt you to http://www.browserwars.com. This trick only works for sites whose names start with www. and end with .com, but hey, that's the majority of them. A further trick: you can type the path to the file you want, too -- entering "savetz/fridge" will zip you to http://www.savetz.com/fridge/, for instance.
This should log you in and display the page in one fell swoop, avoiding that obnoxious security dialog box. Before you call in the dancing girls, know that this feature is a mixed blessing. The good news: you can add your username:password@ URL to your bookmarks, so you'll never have to type your login data again. The bad news: once you've done this, anyone who sits down at your computer and pokes through your bookmarks can access the site, masquerading as you, without your consent. Further, your username and password will be shown in the Location field until you leave the site, visible to anyone who happens to glance at your screen.
You can send the page as text or HTML (or both.) If your colleague uses Netscape or another HTML-savvy mailer, he'll be able to see the page in all its glory, graphics and all. (To save time, Netscape doesn't actually send the graphics, just carefully modified HTML code that points back to the graphics on the Web.) On the other hand, if you send the page as HTML but the recipient doesn't use an HTML mailer, he'll just see a big mess, and you'll surely be off his Christmas list forever.
A word of warning: Send Page works beautifully in Communicator, but your mileage may vary if you try it with Navigator. You have been warned.
There's more cache fun if you can stand it. Enter "about:image-cache" to see what images are in the cache, and "about:memory-cache" to see only the items that are currently cached in RAM. Finally, "about:global" could show you a list of all the sites you've visited lately. (Or, it could crash your machine like it did mine.)
Several web pages, obviously created by people with far too much time on their hands, are dedicated to tracking Easter eggs in Netscape's programs: http://wwwcn.cern.ch/~rigaut/about.html, http://www.secureforms.com/mozilla/, and http://www.yikes.com/netscape/ are among the best. Not all of the eggs that you'll find at those sites will work with your browser -- many of the tricks that worked with earlier versions have mysteriously disappeared in versions 4 of Navigator and Communicator. That's probably for the best -- these browsers already take far too long to download. Although they're fun, those useless Easter eggs do little more than hog valuable memory and disk space.