I freely admit I knew almost nothing about Estonia when I decided to visit. Geography is something that has always interested me but all I knew was that the capital is Tallinn and that it had been a part of the USSR. There was an element of surprise when I saw how far north it was. Recognising the need for a bit less ignorance, I got a couple of books that helped:

Wallpaper* City Guide Tallinn gave me a deeper look at the cultural and artistic aspects of the city while the Bradt guide provided more practical advice.