Can someone explain why this is called a "stimulus"

[dude1394]

When only 29billion of a 825billion "stimulus" package will be spent in 2009, why is this called a "stimulus" package at all?
http://s.wsj.net/public/resources/im...0127193220.gif

And why in a "stimulus" package are we allocating 365billion dollars into projects (road, bridges, etc.) that will take decades to complete? It will take at least a year or two to even put anyone to work building those projects due to enviromental concerns.

Frequently in the past, in all types of federal programs, a noticeable lag has occurred between sharp increases in funding and resulting increases in outlays. Based on such experiences, CBO expects that federal agencies, states, and other recipients of funding would find it difficult to properly manage and oversee a rapid expansion of existing programs so as to spend added funds quickly as they expend their normal resources. The seasonal nature of some spending also affects the speed at which activities can be conducted; for example, major school repairs are generally scheduled during the summer to avoid disrupting classes.

I expect that cutting capital gains to zero and accelerating write-offs on equipment would do more than any of this pork.