Association for Preservation Technology at
www.apti.org
(with an extensive collection of links)

Conservation Online
http://palimpsest.stanford.edu/

IAQ (indoor air quality) in museums and archives
www.iaq.dk
(hosted by the National Museum of Denmark, with articles, photos and more ...)

The Iron Gall Ink Corrosion Website
http://www.knaw.nl/ecpa/ink/

Northern States Conservation Center
www.collectioncare.org
(perform a search on the term "corrosion" to access relevant articles)