Hi,
I would like to collect some helpful websites for learning and practicing the finnish language. There are quite good online-courses out there.
Here´s my personal favorites:
http://www.finnishschool.com --> vocab-trainer by Phil. This helped me a lot before coming to Finland to get some basic vocab. The good thing is that you don´t need a teacher or a book.
http://donnerwetter.kielikeskus.helsink ... -index.htm
extensive site with listening comprehension, texts, grammar. you can download the whole site. I downloaded the Audio and burned it on a CD to listen to while driving.
http://www.edu.fi/oppimateriaalit/ymmarrasuomea/ - lot´s of reading comprehension, complete with dictionary, grammar, etc. The texts always focus on some grammar-topic.
http://www.verbix.com/languages/finnish.shtml Verbix - conjugate any finnish verb. very, very well done!!
http://www.yle.fi/opinportti/supisuomea/ SupiSuomea from YLE. Grammar, reading comprehension, exercises... well done.
Of course the best way you´ll learn finnish is by taking a course in Finland. But studying online might help you get some idea of the language before you come.
[Admin Edit 15/9/2015 - Thanks Hyyrynen]
http://www.uusikielemme.fi/ - Grammar
https://en.wikipedia.org/wiki/Finnish_grammar - Grammar
http://www.verbix.com/languages/finnish.shtml - Conjugator
http://en.wiktionary.org/ - Noun/Adjective declension and conjugator
http://fsi-languages.yojik.eu/languages/finnish.html - You download the .pdf and follow along with the tapes
http://yle.fi/uutiset/selkouutiset/ - News written in simple language together with a native finn reading them slowly.