Guide to Estonian Legal System and Legal Research (GlobaLex)
Written by Jannu Kuusik and Kart Miil. Excellent overview.
The Government of the Republic of Estonia
In English, Estonian and Russian. The official website for the Estonian Government.
In English, Estonian and Russia. Offical state portal, with links to the Constitution and other major legislation in English.
In English, Estonian, Russian and French. Has English translations of significant judgements.