[Bubb1es]

I'm just in the middle of constructing a new site with search engine optimization in mind using asp.

What is more successful in ranking on Google or any search engine;

www.domainname.co.uk/keyword-keyword-keyword/
or
www.domainname.co.uk/keyword-keyword-keyword.asp
or
www.domainname.co.uk/keyword-keyword-keyword.html

Should there also be a limit to the number of keywords used in a url?