I hate, HATE, HATE when I read threads talking about how the government (or the Fed, if you prefer) primarily causes inflation by printing money. Before anyone else comments incorrectly about it, can we all please do some reading to understand how money is created:
http://en.wikipedia.org/wiki/Money_supply
http://en.wikipedia.org/wiki/Money_creation
http://en.wikipedia.org/wiki/Fractional-reserve_banking
http://en.wikipedia.org/wiki/Money_supply
There are several ways to define "money," but standard measures usually include currency in circulation and demand deposits (depositors' easily-accessed assets on the books of financial institutions).
http://en.wikipedia.org/wiki/Money_creation
Contrary to popular belief, money creation in a modern economy does not directly involve the manufacturing of new physical money, such as paper currency or metal coins. Instead, when the central bank expands the money supply through open market operations (e.g. by purchasing government bonds), it credits the accounts that commercial banks hold at the central bank (termed high powered money). Commercial banks may draw on these accounts to withdraw physical money from the central bank. Commercial banks may also return soiled or spoiled currency to the central bank in exchange for new currency.
http://en.wikipedia.org/wiki/Fractional-reserve_banking
When a deposit of central bank money is made at a commercial bank, the central bank money is removed from circulation and added to the commercial banks' reserves (it is no longer counted as part of m1 money supply). Simultaneously, an equal amount of new commercial bank money is created in the form of bank deposits. When a loan is made by the commercial bank (which keeps only a fraction of the central bank money as reserves), using the central bank money from the commercial bank's reserves, the m1 money supply expands by the size of the loan. This process is called deposit multiplication