On the site of the swedish magazine Kamera&Bild they test high ISOs of the D200 under though real life conditions - a game of girls handball in a dimly lit indoor arena. Overall they are very pleased with the noise and AF-performance. Sample photos shot at ISO 2500 and 3200. Jpegs with NR set to normal.
http://kamerabild.mkf.se/ArticlePages/200512/11/20051211173638_ADF644/20051211173638_ADF644.dbp.asp?iPageId=2
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http://kamerabild.mkf.se/ArticlePages/200512/11/20051211173638_ADF644/20051211173638_ADF644.dbp.asp?iPageId=2
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http://www.pbase.com/interactive