I tripped over this site: Wordcount.org. It has a neat flash thingy that shows the 86,800 most frequently used English words. My own name (Michael) is ranked at 1073. Far more common than the F word, which is at 5598. I tried to get a rare word by entering "pangaea" and it comes in at 70,201. So, I tried a different one and finally found a word that's not in the list: recuse. Sort of odd, since lawyers use this word - and we've got plenty of lawyers in the world. The last word in the list, at 86,800, is conquistador. OK ... I'll admit that I've probably never used that word in normal conversation.