Ya well explained by the above poster. Just type the site:name of your domain command in the Google search box and the results will be infront of you. And for seeing the current cache, you would be in need to installed the Google toolbar in your browser, from the page rank button you can check the backward links, similar pages and the cached snapshot of your site but that would be recent cache copy of your page.
This is the easiest way.. Or you can use this command.. view-cache:yourwebsitenamewithextension Write and type in google search box and press enter to see the results