With the update to 10.7.2 we now get the ability to drag files between desktop spaces and full screen apps. I'm not sure what we're supposed to do with this, but I think I've found a use for it. If you drag a link, activate Mission Control, you can then drag the link onto a full screen browser window and open it in a new tab. If there's anyone out there who's still running 10.7.1 maybe you can confirm that that doesn't work until you update.