If you search Google for ams oil, you'll see (at least I did), that the top two positions are held by amsoil.com. Why are both listed like this? I have seen this happen on other sites as well and would like to do it for mine, but how? You would think that Google would only have one listing since they are the same, no? Thanks!
the top two positions are not held by amsoil.com. position one: amsoil.com position two: amsoil.com/redirect.cgi?zo= they are not same url. everypage has PR, backlinks, meta tags, etc. google does not list sites, it lists pages. for example, if you have good seo about : xxx.com and xxx.com/xxx.html , they can be at top two positions.if the second page's seo was better, then it would be in the first position.(backlinks of pages are very important)
completely agree with "addlinkurl". They both are different pages. And according to Google there can only be two results from a single domain in the first 10 results.