One really great way to reduce the amount of 404 hits on your site is to have a "full text Search" as your 404 page, this is also really great for SEO (Search Engine Optimization)
You can enable this option in your "Site Template and Settings" area.

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/Dashboard;/Site Specific Help;/Site Specific Help/Page How To's;/SEO Basics
You can do this by creating a Page alias. If you go here: YourDomain.com > Page Aliases then you can create page aliases. For a quick video on how this area works please go here. Having the URL show a name would look like this: ...
/SEO Basics
There are different ways to edit a page title. We will go over which page titles there are and how to change them. The Product Page Titles are controlled by the Products themselves. See more info here. You can also create a custom title for the ...
/SEO Basics
You can update your Product Meta Data when editing your product. YourDomain.com > Modules > Ecommerce: Products (mX) > Products > Edit Product Near the bottom of the "edit Product" screen. The Page Title by Default (if Custom is not selected) ...
/SEO Basics
You can specify your Meta Content for a Category when editing your Categories. YourDomain.com > Modules > Ecommerce: Products (mX) > Categories See Screenshot: The Page Title by Default (if Custom is not selected) uses the Category name_SKU. ...
/SEO Basics
You can update your Page Meta Content by going to the "Page Settings" area of any of your pages. YourDomain.com > Pages > Default Group > YourPageName (X.html) > Page Settings : There are several Important SEO settings here. Page Meta Keywords ...