When you full screen an application in Lion, it "flies out" of the desktop space it started in, and winds up at the end of the spaces list (assuming you have turned off auto-arranging).
As a result if the app being pulled out of the spaces flow, there is no way to ctrl+1/2/3etc to jump to the space it is currently occupying.
Does anyone know how you can make a keyboard shortcut so you can jump directly to full screened apps?
Best Answer
If you want this for a specific app, you could use an application like Keyboard Maestro to set up a shortcut to switch to that application.
If you want this for every app, I don't think it is possible at the moment. It may come with an update (as the ability to manually re-arrange spaces in Mission Control).
Waiting for a better solution, you can still use ⌃→ and ⌃← to navigate between spaces (including fullscreen applications).