I haven't had much luck finding good information on this subject. For the past 2 months, one of my videos has suddenly received a huge surge in views. The video is over a year old, and for most of its life it averaged 200-400 views per day. Then it started climbing, 1,000/day, 4,000/day, 10,000/day, and is now up to 20,000/day and still seems to be growing. Before all this happened, the video had about 100,000 views. 95% of this traffic is coming from the suggested videos sidebar in YouTube, and it appears to be spread around to a lot of videos. The largest referring video only accounts for 1% of it. I can only see 10 of these, and all of them are almost completely unrelated to the topic of my video. So far, the traffic on my other videos has remained normal. So I'm trying to pin down the variables of this surge so I can try to reproduce it. The beginning of the surge roughly coincides with the time that I hooked up Adsense to my YouTube account, but I didn't monetize any videos for several weeks. The thumbnail of the video is a sexy woman in revealing clothing. While I'm sure that boosts clicks, I doubt this accounts for the fact that the video is appearing in the suggested video sidebar so much. Sorry if this comes off like a brag. I am proud that this happened, but I have no idea why and would really love to repeat it for more videos. I'm just clueless how it happened.