http://biz.yahoo.com/ap/051027/faulty_cameras.html?.v=2

The defect, affecting mostly older model products, occurs under hot and humid conditions
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The defective chip, made by Sony Corp. between October 2002 and March 2004, was used in an unknown number of cameras, camcorders and handheld computers.

Canon's posting on the recall: http://www.canon-asia.com/index.jsp?fuseaction=image-phenomena_notice

Sony's posting: http://esupport.sony.com/perl/news-item.pl?mdl&news_id=95