These are some links that can be useful:
Academic Links
Asociación Española de Economía / Spanish Economic Association
Spanish Economic Review (SER)
Investigaciones Económicas
Hacienda Pública Española
Revista de Economía Aplicada
Economic Links
International Monetary Fund
European Central Bank
Instituto Nacional de Estadística
Banco de España
Other Links
"Freakeconomics" webpage ( by Steven Levitt)