A few years ago I discovered I had a bad habit when typing in a website address. I usually type the www. I know it is usually optional but not always. If you are like me sometimes you forget one of the w's and just type ww.microsoft.com, go ahead give that link a try. As of today's post neither w.microsoft.com nor ww.microsoft.com default to the main site.
If you maintain your own DNS just go in and add a few A or CNAME entries for w, ww, and I even go one more wwww and default them all to www.eyespike.com.