Conservation OnLine IPM Resources. A great general resource page with many links on IPM and treatment methods, bibliographies, pest control services, etc.
http://cool.conservation-us.org/bytopic/pest/
Northern States Conservation Center has excellent overall information for collections care and some information specific to IPM
http://www.collectioncare.org/cci/ccip.html
Smithsonian Center for Materials Research and Education Conservation and Technical Studies has information posted under the Taking Care portion of their website
http://si.edu/mci/english/learn_more/taking_care/index.html
National Park Service Integrated Pest Management page
http://www.nature.nps.gov/biology/ipm/manual/ipmmanual.cfm