Expanding Earth

A friend of mine said he's not sure the earth is the same size as it was millions of years ago, and this is perhaps one reason the biblical flood was global.

I looked into this idea a little bit, and found it to be the topic of this strange discussion with Neal Adams (starts at the 25 minute mark) on SGU.  I also found the idea on Wikipedia.  And, I found this website with positive arguments for an expanding earth.