One reason that banks aren't lending
I read an interested article:
http://needamortgageloan.wordpress.com/2011/05/25/would-you-pay-your-bank-to-not-make-you-a-loan/
Essentially banks have parked 1.2 trillion more in reserves than is required for balances invested in the banks. The fed is paying banks to park their money offering a safer return than would be possible if lending the money.