Can anyone give me a link to the largest single family tree ever recorded? I think mine's pretty big, 220 people and 12 generations.

I have over 49,000 people in my genealogical database in one tree alone. I have a friend that researches primarily only one surname and he has over 30,000 people in that database.

You are off to a good start, but I guess you are talking about direct lines and not the whole family tree. I stopped counting after I went back 14 generations as that only got me back to the late 1500's. There is only two of my family lines that I can't get back further than 6 generations and that is because for one of them I don't have the tiem or money to go to Germany and do more research at this time, the other is just a common name that I just haven't broken the brickwall yet but I will eventually. ;-)

I'm not sure what the largest tree is but I know for a fact that some of the Jewish genealogies are quite extensive.