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I am also having problems logging into any Google site or using the search (check from multiple computers and from other contacts). No problem going to other sites.
Update (one page did load), but others still are only partially loading or are taking a very long time.
For me the ads don't seem slower than normal today, but they are normally appear after the rest of the page has been displayed. Maybe a problem with a certain datacentre.
Earlier today, Google users experienced a massive fail whale. Gmail was down, search was slow, Google Reader, YouTube and image search were all sporadic. Even Google Analytics and non-Google sites with AdSense ads were reporting issues. Of course, most of the complaints could be found on Twitter. If you do a search for “Gmail down” or “Google down”, you will still find a storm of chatter.
Update!: From Google: “The issue affecting some Google services has been resolved. We’re sorry for the inconvenience, and we’ll share more details soon.” Again, thanks, but we know that already, seeing as how Gmail is back up and everything.