AEMI (Association of European Migration Institutions)
The House of Emigrants (in Sweden)
Migration Institute of Finland
The Genealogical Society of Finland
Ellis Island Immigrations Lists
RootsWeb
The Danish Emigration Archives (in Danish)
Norway Heritage
Finding your Swedish Roots

Åland links

Mariehamns stad (in Swedish)
Stadsbiblioteket i Mariehamn 
Ålands landskapsarkiv 
Ålands landskapsregering (in Swedish)
Föglö hembygdsförening (in Swedish)
Kökar hembygdsförening -The local folklore museum
Eckerö kultur (in Swedish)

Also contact

Kinship center in Karlstad, Sweden