I was not able to see the url but was able to find your site. Well, what I believe is your site.
My first thought was what Robert Charlton posted.
It's possible that the change in your structure has caused Google to reevaluate your site...
Usually when you have a dramatic change in site structure there will be a full recrawl and hence more discoveries by more savvy bots.
One thing also, some pages you should "noindex, follow" for example your search results pages and your "tell a friend pages". (If the site I see is yours I see about 4000 or more tell a friend pages in the index)