GOOGLE first look for the the result from its cache version of a website to speed up the search process .
generally this cache is updated at certian intervel by google depending upon the site type .
you can view your result about your site by putting the url of your site in this form.
http://webcache.googleusercontent.com/search?q=cache:example.com
http://webcache.googleusercontent.com/search?q=cache:ctrlgoogle.blogspot.com
you can view the google memory of ctrlgoogle.blogspot.com click hereweb cache