Smithsonian Museums:
SCMRE guidelines on taking care of objects and art.
National Park Service:
Conserve O Gram series on care of objects.
CCI (Canadian Conservation Institute):
notes, bulletins, books and Info on care of objects
PACIN:
Packing, Art Handling & Crating Information Network
Picture Hang Solutions:
Commercial site that has Q & A section
Northern States Conservation Center:
Numerous articles about different collections care.
CoOL:
Conservation online, a project of the Preservation Department of Stanford University Libraries
Art Museum Network:
Internet listing of museums and exhibitions.
American Association of Museums:
List of members and info.