A ton of people go on bing because maybe the pictures or because of 'hotmail'. I would estimate around 10 million people visit bing per day. Welcome :P.
According to comScore, in October 2009, Americans logged in over 9.6 billion searches. Divide that by 30 (days in a month) and you get 320 million searches a day. Worldwide, there are over 2 billion...
It is a very good question you ask because Craigslist gets a truly remarkable amount of traffic.
As a web analyst I would first like to point out that 'hits' is a concept that is rarely used these...