The PlayStation 3 does this when a PlayStation Portable game is downloaded from PlayStation Network and then transferred to the Vita, via USB connection.
This being said there are an overwhelming amount of Vita users who don't have access to a PlayStation 3, I'm sure, but PSP games are still available for purchase and download via Media Go (in the pkg format). Afterwards they are stored on your local hard drive of the computer you downloaded them on, and the PKG can be decompiled into its uncompressed directories (including the EBOOT).
Please correct me if I am wrong, as I sometimes am more hopeful than what's possible, but wouldn't it be possible to figure out how to convert these into a format accessible to the PlayStation Vita via a program or a particular method in general?
This would ease the anger from those of us who are upset with Sony not having these games available for download directly through the store, or those who don't want to loose VHBL, but still play their classic PSP games.
(If this isn't the appropriated section please feel free to move it. Games might be a better section, but I'm posting it in General just to be safe.)