Google Analytics launched a new feature called “Daily Alerts” that send you emails whenever something peaks. To set this up, click on Google Analytics -> your site -> Intelligence -> Daily Alerts -> Create a Custom Alert. You can define which profiles the alert should cover. Then you check the “Email me …” box. I’ve fine-tuned my alert by picking % New Visits -> Is greater than -> 25%. A while later, I received a first alert, which directly linked to Google Analytics. Following the email link you’ll not only see a traffic chart, but also potential reasons for the peak, like backlinking sites which send a lot of visitors that day, or visitor regions which saw particular increases, noted Google Blogoscoped.