I would also be interested in knowing the answer to this. I have the directory from build/Release-iphoneos/*.app dragged over to the applications section ( via i-funbox ), however I'm not sure what needs to be modified for it to be visible on the springboard as an installed application.
Ahaha. I feel a little silly now. (it's funny because I was telling a story about not being able to do this and then realized that it was on my screen and when I hit it, it worked!)
I copied over the files to /Applications and ran ldid -S on the application to sign the app, but I had been trying to run the program from the command line (This used to work, pre2.0).
Funny thing is you need to run is from Springboard, so restart your phone and Wa-La!