Tax cuts to the middle class will put money in the hands of people to who need goods and services that for the past 6 months they haven't been able to buy (or afraid to buy).
This will stimulate mostly retailers who will continue to employ people and should stimulate shippers, distributors wholesalers which will add another level of economic revival.
There will also be infrastructure spending to fix and repair roads, bridges, airport runways, school buildings, water pipes, and electric power delivery grids etc so that people can get to work, goods can be transported. We need reliable roads, transportation and we need reliable utility service and ample supplies of clean water. The side benefit to this is that it will require business to hire workers to do this work which should help relieve unemployment.
Finally, there will be some $$$ set aside to for the governrment to buy & liquidate 'bad assets' from banks. Taking bad assets off a banks balance sheet will make it possible for them to free up loss reserves and lend it to people and businesses who are credit worthy.
In order for all of this work, a lot of things have to go right. America will have hard time absorbing another Hurricane Katrina and a lot of the money will have to come from the money saved once the Iraq War ends.