[awebapart]

I think you've done a good job with the limited tools you have had at hand, i.e. the Office Live sitebuilder, you've certainly used it in anger more than most Office Live website owners, especially in the Products section (which couldn't have been easy).

Whether .aspx, or .htm, or .html at the end of a url has any affect on SEO is another thing that is debatable, negligible at most. Some people say that it shouldn't matter since google will ignore common file extensions in the url, others might say that google might not ignore it completely in all cases and there might be some adverse affect since an end url like /businesscards is 100% focused on "business cards" whereas an end url like /businesscards.aspx is diluted in that business cards take up, as a simplified example, say 72% of the end url (e.g. 13 out of 18 of the characters). There is also the other issue of nesting further pages further down a directory structure in the future, e.g. changing the one page /businesscards into a section with pages underneath it like /businesscards/roundedbusinesscards which is easier when file extensions are not used in urls (but that is usually more a static HTML website thing).