If I remember correctly Bing started using Yahoo to power its searches. I give Microsoft credit though because at least they got rid of Yahoo and are still competing against Google with their own search engine. It's not as good as Google but at least is an alternative to use when we feel too paranoid about giving too much information to Google. It's a shame that Yahoo is closing its directory service. This might be as bad as when they decided to close Geocities. That was the saddest day I can remember.