How can I get dictionaries for more input languages?
It looks like that all dictionaries are embedded into keyboards, but you can try to find the dictionary by searching in Android market with query: 


  Your_desired_language language pack


For example for "Finnish language pack" there are packs for 3 different keyboards: SlideIT, AnySoftKeyboard and Gingerbread keyboard (unfortunately not the original one, you should install Gingerbread keyboard app from market even if you already have original Gingerbread keyboard).