Line this up with the recent article about how the (very modest) capital gains tax isn't returning as much as was expected.
I think we can ramp up taxes on the wealthy a little more.
Of course, some of them will cry and threaten to leave. Let them go, someone else will step in and do what they do for less money. Keep in mind, these people do not, by and large, add value--quite the reverse, they skim off the value everyone else adds through their labour.
When they cry about a brain drain, let them. Don't be afraid to throw in a "don't let the door hit you on the ass", too.