Contact them. I had the same thing happen, contacted them and they explained they had updated their algo and would take a look at it... I explained it was all css/xhtml/ada compliant and that there was no blackhat going on. 2 weeks later it was back in their index. I think they are aware that there are problems with the "new and improved" Live Search algo...

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Jim Summer
Jacksonville, FL USA
http://tentonweb.com/
Jesus said: "I am the way and the truth and the life. No one comes to the Father except through me." John 14:6