This may be just me being impatient, but I often hit the Google cache if the site isn't down, but just responding slowly at the moment. It's a nice convenience factor when I'm looking for something quickly.<p>As such, it annoys me when sites disable the caching; if a site with no cached version takes more than a couple seconds to respond, I generally go elsewhere and will probably retain a negative impression of the site.<p>I also note that neither of his two reasons for blocking caching have anything to do with improving the user's experience.<p>On the other hand, I'm not the target audience for most sites, so it probably doesn't matter much.