iPhone 3G Wi-Fi Issue

Apple Replacing iPhones With 2.2.1-Related Wi-Fi Issues
http://theappleblog.com/2009/04/08/apple-replacing-iphones-with-221-related-wi-fi-issues/

iPhone 2.2.1 Wi-Fi failures linked to battery heat
http://www.ilounge.com/index.php/news/comments/iphone-221-wi-fi-failures-linked-to-battery-heat/

iPhone Wi-Fi failures caused by battery heat?
http://reviews.cnet.com/8301-19512_7-10218183-233.html

2.2.1 iPhone 3G Wifi Problems
http://discussions.apple.com/thread.jspa?threadID=1971698&tstart=0