Cuuks suggests ingredients for flavor compositions.
Flavornet is a compilation of aroma compounds found in human odor space.
Flavour Profiling and FoodPairing analysis

VCF 2000: Volatile Compounds in Food Database
The VCF database contains information on published volatile compounds which have been found in natural (processed) food products.

IG Sensorik .ch
Interessengemeinschaft der Schweizerischen Gesellschaft für Lebensmittelwissenschaft und -technologie (SGLWT) Informationen zu aktuellen Themen, Veranstaltungen und Aktivitäten im Bereich der Lebensmittel-Sensorik.
Molecules you’d better learn to live with them.
Searchable databases on perfumes, fragrances, aromatherapy, essential oils and flavors.

TED Talk: Luca Turin on the Science of Scent
Luca Turin explains the molecular makeup of a scent.