This sounds awesome, but let's be realistic. How can we determine who gets funding? If the government treats the appropriation of funds for FOSS projects similarly to the bail-out of financial institutions, the only projects that would qualify are the ones that are ailing.
At the risk of being a troll (albeit a realistic one), can you justify taxpayer dollars for projects like OpenOffice?
Clearly, the government cannot treat FOSS projects in the same as financial bailouts. Therefore, what system could be put in place that determines which projects receive stimulus funding?