How much sense does it make to use one search engine's traffic to gauge usage of another's? Anyone with ask.com as their home page / default is not counted.
Hmm. I just checked with quantcast, and the graphs are similar: http://www.quantcast.com/ask.com http://www.quantcast.com/nytimes.com http://www.quantcast.com/cnn.com
also it gives an estimate of 110M visitors per month. Not too shabby.