Considering the variety and the heterogeneity of genomics databases or data sources (DS), we figure an ``almost-ideal'' situation where the following facilities are provided: (i) one can easily locate existing DSs and know about their content and the services they offer, (ii) one can easily identify and select among existing DSs those that can contribute to satisfy one's needs; (iii) one can easily navigate, extract and combine information coming from selected DSs. This paper exhibits some services that help reaching these aims.