Google has launched a new tool within Google Webmaster Tools that allows Webmasters to create custom 404 pages.

To access the tool, go to Google Webmaster Tools, then click on tools on the left and then click on “Enhance 404 pages.” You can then copy and paste the widget code from the Google site, into your page template. For example, I set up a page at the Search Engine Roundtable at seroundtable.com/advertize.html, notice I spelled advertise, with a “Z.” Google automatically notices that I have a page at advertise.html, and offers that as an option for people to visit. Here is a screen capture:

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