Some Data Sources...

Official statistics for Austria & EU:

InfoChimps - all and everything, rather US-centred, mostly census-data:

BIOLFLOR - Comprehensive database on species traits of plant species (German flora), overwhelmingly extensive:

GBIF - a compendium of  almost all species-distribution databases available:

IUCN-Webpage, spatial data for endangered species:

EEA, Eionet Central Data Repository. Spatial, environmental, diversity data, etc: