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shorebreak - 4:15 pm on Apr 28, 2005 (gmt 0)
Google: ~25% of clicks to paid, 75% to free
Back in early 2004, the distribution was:
Yahoo: 35% to paid, 65% to free
MSN: 50% to paid, 50% to free
ASKJ: 70% to paid, 30% to free