Nalgene has announced it will stop making bottles with plastic containing bisphenol-A. The chemical may be linked to early onset of puberty and increased risks of cancer.
The New York Times has a story on the BPA controversy, and manufacturers who hope to capitalize on a market for non-BPA plastics:
http://www.nytimes.com/2008/04/25/business/worldbusiness/25plastic.html?_r=1&scp=1&sq=nalgene&st=nyt&oref=slogin