Hard drives should be wiped clean before disposing of them.
A common misconception concerning network security is the meaning of the term "defense in depth".
It's not easy to slipstream a bunch of patches properly into Windows.
Slipstreamed installation points are good for deployment--provided you remember what you slipstreamed into them!
One way of minimizing downtime due to patching systems is to batch a bunch of patches together and apply them in one shot.