"If the blog supports comments, it needs to talk to databases." No it doesn't. Comments aren't added all that much relative to how much your site is getting h

"If the blog supports comments, it needs to talk to databases." No it doesn't. Comments aren't added all that much relative to how much your site is getting hit. It would make more sense that the page is just a static html file with a form. The form submits to your app engine (php/python/whatever) which adds the data to the database. That then triggers your static html file to be rewritten to display that comment as well. The only other modification you "may" want to make is set it so that browsers don't cache your html page so they can see new comments if they refresh.