Oh, Well you could edit the URL for the xil xmls in the sprx, and then you can have any apps appear on the XMB whenever and wherever you want just like singstar, and you can update them remotely by changing the xil xml on the server end.That's cool, but i'm thinking a way like xil apps, shows in the xmb to install and after beeing instaled the same shortcut will launch it, but i think it is not possible with normal xmls
Its a while since I messed with xil, but I know it is possible as this is how the very first XMBPD worked.
This was all done with xil xmls

