The one thing you can find on a not found page
I hate clicking a link and getting 404 pages. Usually it's a boring blank page letting you know that you're not getting to where you thought you were. Thank goodness the internet is so large it almost doesn't matter, just move on to the next page. That my be the exact reason why we your website might need a 404 upgrade. Renny Gleeson speaks about 404 pages and why it may be important to upgrade your websites now.