http://rhyme.poetry.com/
it seems to be an useful/fun dictioanry.
I don't use it but I think it's the most useful dictionary. And you can write poems, not that I write poems but when I decide to write some I go to this site.
http://translate.google.ee/#
I often use it, not to translate to english but from estonian to german and vice versa because I have to do my homework.