I don't know any Estonians, so there won't be any content from me in the foreseeable future. If you are Estonian, send me an e-mail, and maybe we can work together on the booklet and site.
Check out the www.eki.ee/ Institute of the Estonian Language.
Jancada has a good Estonian foreign language page
Check out In Your Pocket for guides to Tallinn and Pärnu. Their guides are always up-to-date, and quite complete, plus they're cheap. If you don't order one beforehand, I think that they are available at most kiosks in those cities.
How Similar are Estonian and Finnish?
This article by Eugene Holman of the University of Helsinki discusses the declensions and conjugations of both languages.