That is what the US are offering Turkey in exchange for their support with Iraq. That, incidentally, is about 35% more than the entire US budget for NASA, and is about 40% of the total budget for the US Department of Education. Incidentally, $20 billion would be more than enough to make up for all the holes in every state's education budget that Bush's economic bungling has brought about.
Of course, $20 billion is just a bribe for Turkey... there will be money for Jordan, money for Israel, money for Kuwait, money for Saudi Arabia, money for Qatar -- everyone will want their turn at the trough.
Tomorrow, Turkey's parliament is having a vote on allowing US troops to be based out of their country for an invasion of Iraq. You can contact the Turkish embassies and parliament members and let them know you are opposed to Turkey allowing US troops to operate out of their country... but I half wonder whether they are bought and paid for already. After all, the US just offered them an amount equal to approximately 5% of their economic output for a whole year.
... and if that's not a bribe, I don't know what is.