... to just take that $4 billion, and cut a "bonus" check to every IT worker in America.
The problem isn't that women don't know how to program as well as men, it's that the field just isn't as attractive to them. Woman tend to value job stability over income, and it's hard to find that kind of stability in IT. IT requires a lot of brains, a lot of hard work, isn't very social, has a lot of guys with behavioral issues, and their job might get outsourced to India so the MBA middle manager can get his quarterly bonus and afford some more blow.
IT and the medical field require similar levels of intelligence and work, yet medical jobs don't often get outsourced to China, the demand for medical skills is relatively constant, and while there are behavioral issues, they usually fall along the Doogie Howser Dipshit Doc/Nurse axis rather than the male/female axis.
Do you want to attract women to IT? The best way to do it would be to change it in ways which also make it more attractive to men too: 40 hour work weeks, reasonable pay for the work/brainpower involved, job security, etc.