The initial Google Panda update hit at the end of February and it took out tons of websites. Luckily, my websites escaped unscathed, and I breathed a huge sign of relief.
Unfortunately, this was just the first of many Google Panda updates. In April, when Panda Update 2.0 struck, I was not so lucky. One of my most profitable sites got hit hard, which put a big dent in my earnings.
Which was surprising, since it was an aged site, with all unique and quality content. Plus, it had good user engagement with lots of real, blog comments.