Sorry for my Stupidity lol, but where can I download this?
If you're truly looking for the Software Development Kit (SDK), it's available on one of the Google sites. If you're looking for 2.2, it's not yet available.
I am thinking that the OP was referring to where to download the APP that allows you to lock individual APPS that you made reference to when you asked why they would want that in the 2.2 update when it is available in an APP.
Apologies. If that was the topic of the question, the answer is either "Protector" or "App Protector." Each provides roughly the same functionality, i.e. enabling the user to set a password for access to any app on the phone. Both apps have both "free" or "trial" versions and paid versions.
The two apps appear to be the products of a fallout among a common set of developers, so choose your poison. I haven't checked in awhile, but at one point, I believe one app enabled unlocking only once until the phone was power cycled and the other required a password each time an app was used.