Private data from YOUR server logs may show otherwise, though. I'm in contact with a referral measurement service along the lines of Hitwise (not as big by a longshot, but representative IMHO), and across the board the number is below 1%. Not only that, but you'd find few sites at all above 1%. My own site shows Ask Jeeves referring 1.2% of all search traffic. I suppose you could factor in a number of other IAC properties and reach the 2.x% number, but counting just Ask and Teoma... I'm afraid it's more realistic to say 1.5% to 2.0% as the real share.