netmeg - 7:16 pm on Jan 27, 2011 (gmt 0)
Your problem is not severe, fsb4e, you just need to do a little housekeeping is all. When you have a long list of products in a category, zen cart will tack on an extra &page=2 to the URL to note that the user is looking at the second page of results. Same thing with sort - because if a user is looking at products sorted alphabetically by product name, the URL is slightly different than if he's looking at it sorted by price.
You just need to tell Google to ignore those parameters:
(make sure you include the ampersand)
And there are several ways to do that - in GWT, or in robots.txt for example. (Although robots.txt won't remove the ones that are already in Google)