Vocabulary Size

Took one of those 'tests' that are abundant on the net today - this one estimated how many English words I knew.

Your total vocabulary size is estimated to be:

45,000 words

Not bad considering the average is somewhere between 20K and 35K for a native speaker and around 9K for a non-native speaker.
There are however 300K words in the English language (as published in the OED) so I need to do better.
Now if I can find a similar 'test' for any of the other languages I know, mayhaps I can do as well on them.