Bankers will tell you that the subprime meltdown was just that: the product of irresponsible lending to, and borrowing by, flaky consumers, not a broader crisis of securitisation.
Multiple keyboard actuations are now possible (shift plus a letter, for example), though it's not perfect -- things start to get flaky as your second press gets physically close to your first one, which makes some sense considering that the switches are placed at the screen's four corners.