Linked from
The 5 pages that link to Ethanolamine, each with the reason it gives.
CholineCompared with: It is a close structural counterpart to choline in membrane-lipid synthesis.
EthylamineCompared with: Its hydroxyl group makes it more polar and less volatile than ethylamine.
AnandamideBroader topic: Anandamide consists of arachidonic acid joined to an ethanolamine group.
PiperazineRelated: Ethanolamine can be converted into intermediates used to manufacture piperazine.